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Please don't try anything you're about to see at home.

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Where would you call experts?

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On this episode of Myth Busters, 2, 1, go!

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Awesome! Adam, Jamie getting down and dirty.

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I've never seen anything like that.

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Testing that an explosion inside a sewer...

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That sewer is getting pretty full of methane.

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Turns manhole covers into missiles.

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This is killing me!

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Then, Carrie Turing and Grant take on the fan fable...

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Love when I get struck.

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That truck bedliner is indestructible.

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With car crashes.

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I'm okay!

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Angry attack dogs.

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And an end with a bang finale...

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Can bedliner really save your life?

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A lot of people ask me, do you ever get tired of blowing stuff up?

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I tell them no.

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Who are the Myth Busters?

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Adam Savage.

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Am I missing an eyebrow?

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And Jamie Heineman.

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Things are going to start to get a little crazy in here.

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Between them more than 30 years of special effects experience...

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Together with Carrie Byron.

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I'm to wreck this car.

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Tori Belachie.

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Oh, he survived!

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And Grant Himahala.

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Save yourselves!

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They don't just tell the Myths...

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They put them to the test.

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So is every story we do an excuse for you to wear a funny hat?

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You should know the answer to that by now.

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Although specifically in this story it's quite apt because we're doing a myth about sewers.

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Sewers.

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Well specifically explosions within sewers.

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You mean like from a methane build up?

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Yes, but it's not just about methane explosions.

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It's about during a methane explosion do the manhole covers in the street above the sewer,

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get blown high into the air.

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Well that sounds like classic.

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It's perfect for us.

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I totally agree.

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It's no myth that the decay of waste inside sewers makes them the perfect breeding ground for combustion.

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However, could a stray spark trigger an epic explosion and send manhole covers skyrocketing?

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Could a manhole ever turn missile?

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What's the plan?

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Well it seems clear to me that this myth has to end with us testing it full scale.

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We need full size manhole covers over a real sewer.

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I agree, but you know what, before we lock in on a full size plan, let's do a small scale one first and see if we can learn anything.

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Sounds like a good idea.

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This ought to do it.

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So to find out if a methane kaboom can make manholes fly, the mythbusters get their minds into the sewer.

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This is a Schedule 80 steel pipe and I'm about to make it into a miniature sewer with a viewing port all along one side,

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which is hopefully going to be explosion proof.

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This cumbersome pipe should perfectly replicate a sewer in miniature,

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but with great weight comes great responsibility.

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You see us build a lot of stuff on this show and a lot of times it's kind of like jazz.

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We are really just figuring it out as we go along.

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Oh, it's beautiful.

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But when you're building something this heavy and substantial, you can't quite do it that way.

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You actually have to plan two or three steps ahead.

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Let's weld this puppy down.

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Because everything you're doing and everything you're going to do is going to require moving hundreds of pounds of steel around.

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Oh, this is heavy.

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Not only can it make it logistically difficult, but fingers can be lost, eyes can be poked out.

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It's dangerous.

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Watch your fingers.

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It's lovely.

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Yeah, it is.

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I can't believe this is a small scale.

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It may be big, but to withstand a methane explosion, it has to be.

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And to complete its authentic aesthetic, Jamie needs to make these.

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That's a manhole cover.

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So clearly in a sewer, there's all sorts of waste, human waste, household waste, and those wastes produce the dangerous gases that can lead to an explosion.

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That's not how we're creating our gases.

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Now we're just calling up the welding store and bringing in some methane and pumping it in.

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But remember, methane is a little tricky.

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It requires a lot of oxygen.

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But remember, methane is a little tricky.

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It requires a precise ratio of air to gas in order to explode.

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9% in three.

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And that's exactly the ratio that we'll be using today.

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Why?

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Because this myth isn't really about the circumstances that lead to an explosion.

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It's about what happens afterwards.

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The question we're answering is, will those manhole covers fly sky high?

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To find that out, Adam and Jamie are going to test a series of potentially explosive sewer scenarios.

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The first test is the most standard sewer setup, an open-ended system.

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Here's how this procedure is going to go down.

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First, we fill our chamber with this.

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Methane, exactly 0.12 cubic feet, or a stoichiometry of 9.5% gas to air by volume.

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Alright, you ready? I'm going to turn on the gas.

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I'm ready.

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Okay.

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That gas will flow into the chamber until it's the correct amount, then we shut off all the valves.

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Then we mix the air and the gas.

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With this, this little whisper fan, we turn on this fan for exactly two minutes.

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Let the air and the gas get together.

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It's a nice-looking rig.

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That might be in the running for the heaviest small-scale thing we've ever built.

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At that point, we will plug in this neon transformer setting this mark, and hopefully,

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whoops, whoops, whoops.

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Getting the manhole cover launches of our dreams.

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But will the free flow of air and gas in the open-ended sewer mean the manholes fly?

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This is drain disaster, open system, and three, two, one, go.

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That was totally boring.

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I was like, huh.

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Wait a minute, let me do that again. Hold on.

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Ha!

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Despite igniting the methane at its explosive ratio, the manhole covers didn't get air.

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Manhole cover check one, two, three, all still on.

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I don't think an open system is that energetic.

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No.

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That will reason for that lethargic blast.

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Well, for that, it's over to the Heinemann.

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Think of this like a gun.

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If the back of the barrel of the gun is closed, then the exploding gunpowder goes this way

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and pushes the bullet out the end of the barrel.

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However, if that breech is open, the gas is going to follow the path of least resistance

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and escape here, and it's not going to do anything to the bullet.

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It's not looking good for the open system, but this myth doesn't rest there.

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I'm making a mess.

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For science.

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There's a whole lot more manhole mayhem to come.

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Ha!

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Next up is a fan favorite with three times the carnage.

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All right, so you guys are familiar with bed liners, right?

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Yeah.

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It's the stuff you spray in your pickup truck bed to protect it.

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Right.

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Now, officially, it's known to stop scratches, dents, and rust.

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But unofficially, people are claiming that it is practically indestructible.

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You have all sorts of crazy stuff on the fan site that you can make a suit dog proof.

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You can make car crash proof.

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You can make a house blast proof.

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I assume we're taking most outlandish and testing, right?

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Exactly.

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Bed liners use to line the beds of trucks and protect against dings and scratches.

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But according to the fans, that's not all.

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Supposedly, it can defend against damage in a host of unconventional conditions.

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So we're going to be working with the tack dogs, crashing cars, and exploding houses.

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I think I love this myth already.

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Okay, well, before we get too far, let's find out what the bed liner is made of

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and how it performs under normal conditions.

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Buzz kill.

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Science.

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Ready to find out about bed liner?

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I got a few questions.

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So first, it's time to bed down and find out just how this stuff works.

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All right, Mark.

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So what exactly is bed liner?

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The bed liner material is a two component polyurethane, polyurethane, elastomeric coating.

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What is it normally used for?

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You'll find these coatings do very well where there's a high abrasion, where typical paints will not hold up.

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So the applications are endless.

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Yeah, but if you turn it through any explosions, they're been attacked by dogs.

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Not today, no.

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Right, so bed liner is really only designed to guard against dings and scratches.

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So now to get started on what the fans claim it can do.

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Number one, can bed liner make your car crash proof?

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To find out, they've got a car.

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So now to give it a very special paint job.

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We're going to spray half of this car with bed liner and leave the other half completely clean.

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This car is not been in any accidents and there's not a dent on it, so we're starting to scratch.

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With the aid of the bed liner ninjas and the time lapse camera in no time at all.

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This is totally carried. That's amazing.

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All right, well you get on the unsafe side.

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I'm driving.

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All right.

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See, abrasion resistant.

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Abrasion resistant, maybe.

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But to find out if it's crash proof, it's time to crash it.

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I don't like carpooling. Could we not carpool anymore?

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Love when I get to drive.

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We're going to simulate a minor fender bender.

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To do that, we're going to back our car in the treated and untreated side into this barrier at six miles an hour.

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We want to get minor damage and compare the differences.

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Yep, and six miles per hour still equates to a 5,000 joule impact.

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Okay, this is six miles per hour rear bumper test. Here we go.

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First on the untreated side.

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Wow, you got all of that one.

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A little more violent than I expected.

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And then the bed liners start.

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Nice job, man. I don't think I'll ever get used to that.

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Grants no fan of rear enders, but it does seem like the bed liner can take the strain.

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You know what? I'm going to have to say that was a win for the bed liner.

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Look at this. It's still intact.

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Dude, that's crazy.

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The untreated bumper is shattered while the bed liner is practically untouched.

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But can it survive a six mile per hour assault from the front?

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This is going to be funny.

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Oh my God, what are you, blind? Just kidding.

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All right, that was a good hit.

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I'm okay. Human crash just dummy.

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Well, that was a solid hit and it looks like the bed liner wins again.

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Dude, look, we have cracking here and here, but none on the bed liner side.

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That is totally amazing.

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And that's some serious damage right there.

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Serious damage, but a collision of six miles per hour is relatively tame compared to what's coming up next.

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On the other side of the break, Tori puts an ultimatum.

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Oh my God, that was so fun.

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Later, it's Adam and Jamie and the great drain disaster.

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That sewer is getting pretty full of methane.

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In this drain disaster, supposedly a sewer explosion sends manhole covers sky high.

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However, with their open ended system, that wasn't the case as the explosion took the path of least resistance.

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So for the next test, the mythbusters are closing the sewer and that's not as crazy as it sounds.

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There are many places in which a sewer can become a closed system.

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You can have a large pipe that immediately makes a right angle turn into a small pipe.

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Gases have a hard time going around corners like that when they're under pressure.

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You can have a part of the sewer above water with a bunch of the sewer underwater.

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All of a sudden that becomes a closed system.

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But will a methane explosion in a closed sewer make the difference and send the manhole covers sky high?

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3, 2, 1, go.

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Awesome.

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Apparently, yes.

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All of that hole covers went and it sounded cool too.

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The high speed referee proves that not only did the lids flip, but they got significant air.

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Well that worked pretty much exactly as we hoped it would.

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And here's what's going on there.

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The reason those manhole covers start to fly before the fire even gets to them is that the fire is an expanding gas.

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And it is pushing air ahead of it, kind of like a piston.

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That piston is causing an increase in pressure which is released by the manhole cover flying.

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That's what we wanted to see.

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Go.

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The closed sewer scenario may have achieved manhole flight, but there's one more parameter for the guys to test inside their small scale drain.

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I'm making a mess for science.

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Mom, this is the way it's supposed to look.

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That's right, they're adding to breathe because more junk might lead to a bigger kerfunk.

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Now you might be looking at this and thinking, how is your chamber full of springs and coiled wire anything remotely approaching a real world scenario?

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How does that kind of blockage occur in a real sewer?

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Well, actually it does.

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Real sewers have all sorts of things like remnants of workmen working on them, schools of wire, ladders, equipment, things that washed into the sewer,

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different sizes of pipes in the sewer that actually change and constrict the air flow.

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This kind of thing can absolutely happen inside a sewer.

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And with the springs providing 20% blockage, will they put a spring in the step of the manholes?

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All right, here we go.

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Drain disaster, small scale, 20% obstruction, single ignition source, and three, two, one, go.

241
00:14:32,000 --> 00:14:33,000
Oh!

242
00:14:36,000 --> 00:14:42,000
The scattering of springs accelerated the burn for the most dramatic drain explosion so far.

243
00:14:42,000 --> 00:14:46,000
Wow, look at that, how fast it moves!

244
00:14:48,000 --> 00:14:50,000
I've never seen anything like that.

245
00:14:50,000 --> 00:14:52,000
That is like a fireworks show.

246
00:14:52,000 --> 00:14:54,000
That was amazing.

247
00:14:56,000 --> 00:14:58,000
So what's happening here?

248
00:14:58,000 --> 00:15:05,000
Well, if you look at the unblocked burn, you'll see that the flame front is taking up maybe in this case about a quarter of a square foot.

249
00:15:05,000 --> 00:15:08,000
It's moving out spherically from the ignition source.

250
00:15:08,000 --> 00:15:16,000
But looking at the blocked burn, you'll see that the flame starts to wrinkle the minute it meets these obstructions that we put in the chamber.

251
00:15:16,000 --> 00:15:20,000
That wrinkling creates a much larger surface area.

252
00:15:20,000 --> 00:15:22,000
It may be several square feet for all we know.

253
00:15:22,000 --> 00:15:31,000
But the end result is that the flame front is able to accelerate much muck more quickly throughout the burn and it leaves the other one behind in the same time.

254
00:15:31,000 --> 00:15:32,000
Go!

255
00:15:32,000 --> 00:15:38,000
And that speedy flame front creates the pressure that propels the manhole cover sky high.

256
00:15:38,000 --> 00:15:42,000
Up over 36 inches, number three, number two, and number one.

257
00:15:42,000 --> 00:15:44,000
And they're off the scale.

258
00:15:44,000 --> 00:15:46,000
Freaking awesome.

259
00:15:46,000 --> 00:15:49,000
Well, that's what we need to do in the full size.

260
00:15:49,000 --> 00:15:51,000
I think we have our testing parameters.

261
00:15:53,000 --> 00:16:02,000
Carri, Tori, and Grant are on a collision course, finding out if truck bedliner can make your car crash-proof.

262
00:16:02,000 --> 00:16:05,000
And so far, it's looking good.

263
00:16:05,000 --> 00:16:11,000
Look, we have cracking here and here, but none on the bedliner side.

264
00:16:11,000 --> 00:16:13,000
That is totally amazing.

265
00:16:13,000 --> 00:16:18,000
All right, we've already established that bedliner works pretty well for low-speed crashes.

266
00:16:18,000 --> 00:16:22,000
Now it's time to put it through the ultimate test, a high-speed crash.

267
00:16:22,000 --> 00:16:24,000
And for that, Tori's going to ramp.

268
00:16:24,000 --> 00:16:26,000
All right, Tori, whenever you're ready!

269
00:16:26,000 --> 00:16:35,000
Tori's going to ramp both sides of the car at 25 miles per hour, or with an impact force of 50,000 joules.

270
00:16:39,000 --> 00:16:40,000
Nice!

271
00:16:41,000 --> 00:16:46,000
Remember, this is for science, and Tori is not enjoying himself at all.

272
00:16:49,000 --> 00:16:53,000
Oh my God, that was so much fun!

273
00:16:53,000 --> 00:16:56,000
What's red and white and dent it all over?

274
00:16:56,000 --> 00:16:57,000
Nice!

275
00:16:58,000 --> 00:17:04,000
After both impacts, the difference between the control and coated side is negligible.

276
00:17:04,000 --> 00:17:06,000
Check it out.

277
00:17:06,000 --> 00:17:08,000
That's some pretty good damage there.

278
00:17:08,000 --> 00:17:10,000
Hey, it's a little better on this side.

279
00:17:10,000 --> 00:17:12,000
Yeah, but I mean, barely.

280
00:17:12,000 --> 00:17:16,000
You know what? This is still busted because it's definitely not crash-proof.

281
00:17:16,000 --> 00:17:19,000
All right, yeah, it helped a little bit, but didn't do it.

282
00:17:19,000 --> 00:17:20,000
Good work, man.

283
00:17:21,000 --> 00:17:26,000
Now, the fansite claims that bedliner is indestructible. You coat your car in it.

284
00:17:26,000 --> 00:17:29,000
It's not only dent-resistant, but it's crash-proof.

285
00:17:29,000 --> 00:17:32,000
I think we proved them wrong on that.

286
00:17:32,000 --> 00:17:36,000
Anything small, abrasions, little tiny dings, definitely helped.

287
00:17:36,000 --> 00:17:39,000
But you get anything more severe, it's busted.

288
00:17:39,000 --> 00:17:41,000
Crash-proof is busted.

289
00:17:41,000 --> 00:17:47,000
But how about claim number two? Can you make a DIY dog-proof suit with bedliner?

290
00:17:47,000 --> 00:17:55,000
So to see if bedliner can actually make a fabric bite-proof, we're going to build a dog-biting robot.

291
00:17:55,000 --> 00:18:00,000
We'll find out what fabric works the best, and once we've figured all that out, then we'll bring in the real dog.

292
00:18:01,000 --> 00:18:04,000
Ultimately, Tori will face the jaws of fate.

293
00:18:04,000 --> 00:18:14,000
But to make sure they're not barking up the wrong tree, first, RoboChop will test if there's any truth to the bedliner being dog-tooth-proof.

294
00:18:16,000 --> 00:18:18,000
Now, this is an actual German Shepherd skull.

295
00:18:18,000 --> 00:18:23,000
We've done a little bit of research, found out that the German Shepherd bites down about 400 pounds of force.

296
00:18:23,000 --> 00:18:28,000
So we're going to take a pneumatic cylinder, put it right in this bit here,

297
00:18:28,000 --> 00:18:35,000
and that way we can precisely control the speed and the bite force until it exactly matches a real dog.

298
00:18:36,000 --> 00:18:39,000
Here we go. In three, two, one.

299
00:18:44,000 --> 00:18:46,000
I call that successful.

300
00:18:47,000 --> 00:18:50,000
And for its next meal, Carrie has found these.

301
00:18:50,000 --> 00:18:56,000
We're going to spray bedliner on each one of these different fabrics and see which one's going to be the best for a dog-proof suit.

302
00:18:56,000 --> 00:18:59,000
We have leather, denim, canvas, and a quilted jacket.

303
00:18:59,000 --> 00:19:06,000
Those are the contenders, and the winner will be coated in bedliner and hopefully make an attack dog pause.

304
00:19:07,000 --> 00:19:12,000
Now I'm going to apply a 1-8 inch layer of bedliner, exactly what you have in a truck.

305
00:19:14,000 --> 00:19:15,000
It's like a carnival game!

306
00:19:16,000 --> 00:19:26,000
With one arm sprayed and set, and RoboChomp calibrated to a tech scan rating of 400 pounds, which fabric can strong arm its bite?

307
00:19:26,000 --> 00:19:27,000
Alright, sick of boy.

308
00:19:27,000 --> 00:19:29,000
Okay, control test dog bite, denim.

309
00:19:29,000 --> 00:19:31,000
Here we go. Three, two, one.

310
00:19:33,000 --> 00:19:35,000
Alright, you got a nice bite.

311
00:19:35,000 --> 00:19:36,000
That's a bleeder.

312
00:19:37,000 --> 00:19:38,000
What?

313
00:19:39,000 --> 00:19:47,000
Unsurprisingly, 400 pounds of bite force is more than a match for the leather, denim, canvas, and quilted jacket.

314
00:19:47,000 --> 00:19:48,000
That.

315
00:19:48,000 --> 00:19:51,000
But how will the bedliner fashion compare?

316
00:19:51,000 --> 00:19:53,000
Okay, first up, denim.

317
00:19:53,000 --> 00:19:55,000
Three, two, one.

318
00:19:56,000 --> 00:19:58,000
Wow, that is strong.

319
00:19:58,000 --> 00:19:59,000
Release.

320
00:20:00,000 --> 00:20:01,000
Wow, kind of treed.

321
00:20:01,000 --> 00:20:03,000
I don't think it can get penetrated.

322
00:20:03,000 --> 00:20:05,000
Well, it starts out strong.

323
00:20:05,000 --> 00:20:08,000
Well, it doesn't look like there is any penetration.

324
00:20:08,000 --> 00:20:09,000
Cool. This stuff's tough.

325
00:20:09,000 --> 00:20:10,000
Leather jacket.

326
00:20:11,000 --> 00:20:13,000
And continues to hold out.

327
00:20:13,000 --> 00:20:14,000
It's not punching through?

328
00:20:14,000 --> 00:20:15,000
No, not at all.

329
00:20:15,000 --> 00:20:18,000
Okay, this is canvas arm with bedliner.

330
00:20:19,000 --> 00:20:21,000
Oh my god, this is ridiculous.

331
00:20:21,000 --> 00:20:22,000
It looks like it's working.

332
00:20:22,000 --> 00:20:23,000
Bedliner quilted jacket.

333
00:20:23,000 --> 00:20:29,000
In fact, on every jacket, the bedliner protects against 400 pounds of RoboChomp.

334
00:20:29,000 --> 00:20:31,000
Look at that, it protected the arm as well.

335
00:20:31,000 --> 00:20:32,000
Not a scratch.

336
00:20:32,000 --> 00:20:34,000
Wow, that's amazing.

337
00:20:34,000 --> 00:20:40,000
It looks like the fans could be right about bedliner being a cheaper alternative to a dog-proof suit.

338
00:20:40,000 --> 00:20:42,000
This coat is a little bit more padded.

339
00:20:42,000 --> 00:20:46,000
I feel a lot safer wearing this if I'm going to let the dog attack me.

340
00:20:46,000 --> 00:20:50,000
So what I'm going to do now is let them coat the rest of the coat, and then we're going to let the dog out.

341
00:20:59,000 --> 00:21:03,000
These high-speed shots are some of the most beautiful things we've ever gotten in small scale.

342
00:21:03,000 --> 00:21:05,000
Where do we stand in going full-scale?

343
00:21:05,000 --> 00:21:08,000
Well, the best-case scenario is a closed system with lots of blockages.

344
00:21:08,000 --> 00:21:14,000
Also, surprisingly, it turns out that nobody, but nobody, wants to let us use a real sewer to blow up.

345
00:21:14,000 --> 00:21:15,000
Shocking.

346
00:21:15,000 --> 00:21:17,000
Yeah, I think we're going to have to make our own.

347
00:21:17,000 --> 00:21:22,000
I'm thinking dig a nice big trench, put down some real sewer parts with real manhole covers, and have a go at it.

348
00:21:22,000 --> 00:21:23,000
Works for me.

349
00:21:24,000 --> 00:21:26,000
Three, two, one, go.

350
00:21:27,000 --> 00:21:34,000
So to upscale their best-case scenario sewer, the guys will need to get down and dirty in ION and build their own.

351
00:21:34,000 --> 00:21:36,000
Nice wide-open space.

352
00:21:36,000 --> 00:21:38,000
Perfect to blow up a sewer in.

353
00:21:39,000 --> 00:21:43,000
Now, of course, the first prerequisite of building your own sewer is a hole.

354
00:21:43,000 --> 00:21:46,000
In order to get started, we're going to need to find a hole.

355
00:21:46,000 --> 00:21:47,000
Here's one.

356
00:21:47,000 --> 00:21:48,000
Perfect.

357
00:21:49,000 --> 00:21:55,000
It's a conveniently large hole for some inconveniently large construction.

358
00:21:55,000 --> 00:22:01,000
Our sewer is going to be 40 feet long, and it's going to be made of sections of something known as box culverts.

359
00:22:01,000 --> 00:22:07,000
They're precast concrete pieces that will be four feet high and six feet wide.

360
00:22:07,000 --> 00:22:11,000
The first thing we have to do is put those in here and join them together.

361
00:22:11,000 --> 00:22:15,000
Yep, and if you thought the small-scale rig was heavy-duty,

362
00:22:15,000 --> 00:22:20,000
that piece of culvert behind me weighs 32,000 pounds, 16 tons.

363
00:22:20,000 --> 00:22:25,000
Altogether, this is the largest construction project we've ever undertaken for an experiment.

364
00:22:26,000 --> 00:22:32,000
It is, and luckily the team of heavy lifters are on hand to choreograph the culverts into place.

365
00:22:33,000 --> 00:22:36,000
I want to send it to music. You guys are like ballet.

366
00:22:37,000 --> 00:22:39,000
These things aren't just decorations.

367
00:22:39,000 --> 00:22:46,000
We saw in our small-scale experiment that obstructions like this dramatically speed up the burn.

368
00:22:46,000 --> 00:22:51,000
And so these may make the difference between man-hold covers that jump up a little bit or a lot.

369
00:22:51,000 --> 00:22:57,000
They're standing in for real-life blockages like sewer servicing equipment and garbage,

370
00:22:57,000 --> 00:23:02,000
and based on the small-scale, they should accelerate the speed of the burn.

371
00:23:02,000 --> 00:23:07,000
You may be wondering why we're going whole hog on this thing, rather than working incrementally up to it.

372
00:23:07,000 --> 00:23:09,000
Why start with the best-case scenario?

373
00:23:09,000 --> 00:23:10,000
Well, for two reasons.

374
00:23:10,000 --> 00:23:15,000
We are spending a tremendous amount of time and energy building a full-size, full-scale sewer,

375
00:23:15,000 --> 00:23:20,000
and we don't know that maybe a mid-scale explosion would render it useless for further tests.

376
00:23:20,000 --> 00:23:24,000
Given the number of unknowns, I think it's safe to say that we only have one shot at this.

377
00:23:24,000 --> 00:23:29,000
The other reason we're going full-scale is because when you scale things up from small-scale to large-scale,

378
00:23:29,000 --> 00:23:36,000
things get very, very complicated very quickly, and given all of that, we want to see what happens to these man-hold covers.

379
00:23:36,000 --> 00:23:38,000
That's why we're going with the best-case scenario.

380
00:23:39,000 --> 00:23:41,000
Ha ha ha ha! Looking more like a real sewer every minute.

381
00:23:42,000 --> 00:23:45,000
Have you guys cleaned up? It's a sewer down here.

382
00:23:45,000 --> 00:23:49,000
It's the best-case scenario, but it's not an unrealistic one.

383
00:23:49,000 --> 00:23:51,000
That looks pretty good.

384
00:23:51,000 --> 00:23:54,000
Sewers are naturally confined spaces.

385
00:23:54,000 --> 00:23:59,000
Add to that what we know about the instances of standing water or pipe configuration,

386
00:23:59,000 --> 00:24:05,000
and this closed system with blockages is the most likely scenario for a blast.

387
00:24:05,000 --> 00:24:07,000
With the sewer structure complete...

388
00:24:07,000 --> 00:24:12,000
Ha ha ha ha ha ha ha ha!

389
00:24:12,000 --> 00:24:14,000
It's almost done.

390
00:24:14,000 --> 00:24:16,000
It's time to make the earth move.

391
00:24:18,000 --> 00:24:24,000
We're gonna bury our sewer under three feet of dirt, because, well, the dirt is actually an important structural part of the sewer.

392
00:24:24,000 --> 00:24:29,000
A sewer that's buried underground will be a lot less likely to blow apart than one that's on the surface.

393
00:24:29,000 --> 00:24:33,000
Indeed, because the only things that are supposed to blow are these.

394
00:24:33,000 --> 00:24:36,000
And now, what this whole thing's all about...

395
00:24:36,000 --> 00:24:38,000
The manhole cover!

396
00:24:38,000 --> 00:24:42,000
This is your basic cast-iron manhole cover.

397
00:24:42,000 --> 00:24:46,000
24 inches in diameter, an inch-and-a-quarter thick, and 103 pounds.

398
00:24:46,000 --> 00:24:50,000
If this indeed is going to become our projectile, we want to make sure we see it,

399
00:24:50,000 --> 00:24:52,000
so we're going to make it a little more camera-friendly.

400
00:24:52,000 --> 00:24:56,000
The distinctive manhole covers are manhandled into place.

401
00:24:56,000 --> 00:24:59,000
You know why manhole covers are round, don't you?

402
00:24:59,000 --> 00:25:04,000
It's the only shape that won't fall through its own hole.

403
00:25:04,000 --> 00:25:09,000
And now, to prep the elements that will make their sewer explosive.

404
00:25:09,000 --> 00:25:15,000
Believe it or not, the methane in this tank is enough to create a blast equivalent to 120 pounds of high explosives.

405
00:25:15,000 --> 00:25:18,000
Now, we're not going to put all of this in our sewer.

406
00:25:18,000 --> 00:25:22,000
We're only going to put a third of it, or 100 cubic feet, in there.

407
00:25:22,000 --> 00:25:24,000
Bye!

408
00:25:25,000 --> 00:25:29,000
But just to be safe, we're going to bury this in a pit nearby,

409
00:25:29,000 --> 00:25:32,000
and we're going to operate it remotely with a solenoid.

410
00:25:32,000 --> 00:25:35,000
Okay, it's done. We're wired.

411
00:25:35,000 --> 00:25:42,000
100 cubic feet of methane will fill their sewer to the perfect stoichiometric ratio for a big boom.

412
00:25:42,000 --> 00:25:47,000
We've optimized the design of our full-scale experiment based on everything we learned in small scale.

413
00:25:47,000 --> 00:25:51,000
We are going for the fastest burn for deflagration possible.

414
00:25:51,000 --> 00:25:55,000
Now, there is a small chance that we could achieve a detonation.

415
00:25:55,000 --> 00:25:57,000
Let's lay some cable.

416
00:25:57,000 --> 00:26:00,000
That means in order to be safe, we have to remove all of our systems.

417
00:26:00,000 --> 00:26:05,000
The gas release, the gas monitoring, and the ignition almost a quarter of a mile away.

418
00:26:05,000 --> 00:26:13,000
With that, their spectacular sewer is ready for what could be the most explosive debut ever on Mythbusters.

419
00:26:13,000 --> 00:26:15,000
They look beautiful!

420
00:26:15,000 --> 00:26:19,000
This sewer is a replica of an actual real-world sewer.

421
00:26:19,000 --> 00:26:28,000
Except that we've optimized it to give it the best possible chance of actually detonating a gas instead of deflagrating it or burning it.

422
00:26:28,000 --> 00:26:33,000
Now, if it just burns, it'll be fairly impressive, and the manhole covers will probably go fairly high.

423
00:26:33,000 --> 00:26:38,000
But if it detonates, they're really going to go high, and here's the thing.

424
00:26:38,000 --> 00:26:45,000
If it detonates, this will be the first incident that has ever been recorded and documented of a gas detonation

425
00:26:45,000 --> 00:26:49,000
occurring from a natural source, like a flame or a spark.

426
00:26:49,000 --> 00:26:51,000
That'll be something.

427
00:26:51,000 --> 00:26:58,000
Coming up next on Mythbusters, can bedliner make a coat bite proof?

428
00:26:58,000 --> 00:27:01,000
Do not try what you're about to see at home.

429
00:27:01,000 --> 00:27:04,000
We're what you call experts.

430
00:27:05,000 --> 00:27:11,000
Dog's man's best friend, loyal, cute, and cuddly.

431
00:27:11,000 --> 00:27:14,000
Well, most of the time.

432
00:27:14,000 --> 00:27:16,000
Alright, sick of them, boy.

433
00:27:16,000 --> 00:27:23,000
Their bite may be worse than their bark, but can truck bedliner protect you from the jaws of an angry dog?

434
00:27:23,000 --> 00:27:26,000
Looks like it's working. Wow.

435
00:27:26,000 --> 00:27:33,000
We're testing bedliner myths, specifically that if you coat a jacket in bedliner, you can make it dog bite proof.

436
00:27:33,000 --> 00:27:38,000
Now, so far, we've created a dog bite rig that can bite down with 400 pounds of force.

437
00:27:38,000 --> 00:27:42,000
Next step is a real arm and a real dog.

438
00:27:42,000 --> 00:27:44,000
Dog's no problem.

439
00:27:44,000 --> 00:27:46,000
Tori's going to provide the arm.

440
00:27:46,000 --> 00:27:50,000
And German shepherd Cliff is going to provide the bite.

441
00:27:50,000 --> 00:27:53,000
But before Tori gets into his bedliner...

442
00:27:53,000 --> 00:27:55,000
Okay, Dan, what do you think is the best way to go about this?

443
00:27:55,000 --> 00:27:59,000
We'll start off with putting Tori in the full bite suit and letting Cliff bite Tori.

444
00:27:59,000 --> 00:28:01,000
Just so he can get the taste of Tori.

445
00:28:01,000 --> 00:28:03,000
And so Tori gets the feel of Cliff.

446
00:28:03,000 --> 00:28:05,000
Does Cliff like Italian?

447
00:28:05,000 --> 00:28:07,000
He's never had any.

448
00:28:07,000 --> 00:28:13,000
That's about to change because for a starter, Tori must own the familiar dog bite suit.

449
00:28:13,000 --> 00:28:16,000
Oh, gee!

450
00:28:16,000 --> 00:28:19,000
And despite the fact he's been here before...

451
00:28:19,000 --> 00:28:22,000
I'm not nervous. I'm scared.

452
00:28:22,000 --> 00:28:26,000
Nobody likes staring down a highly trained attack dog.

453
00:28:26,000 --> 00:28:28,000
Look, Tori, he's salivating.

454
00:28:28,000 --> 00:28:30,000
This isn't going to be good.

455
00:28:30,000 --> 00:28:32,000
Hey, you stop it, there's some dogs! Stop it, there's some dogs!

456
00:28:32,000 --> 00:28:34,000
Fuck!

457
00:28:34,000 --> 00:28:38,000
Good boy! Ah, good dog! Good boy!

458
00:28:38,000 --> 00:28:44,000
As expected, that heavy-duty nylon of the bite suit protects Tori from Cliff's bite.

459
00:28:44,000 --> 00:28:47,000
But Cliff doesn't seem to know that.

460
00:28:47,000 --> 00:28:49,000
Plots!

461
00:28:49,000 --> 00:28:52,000
House! Plots.

462
00:28:52,000 --> 00:28:55,000
You didn't let go that fast.

463
00:28:55,000 --> 00:28:57,000
Apparently he likes the Italian.

464
00:28:57,000 --> 00:28:59,000
Holy crap!

465
00:28:59,000 --> 00:29:01,000
I'm nervous.

466
00:29:01,000 --> 00:29:03,000
I think it's going to hurt.

467
00:29:03,000 --> 00:29:06,000
Do you see how long it took him to get it off me?

468
00:29:06,000 --> 00:29:08,000
Does anybody else feel bad about this?

469
00:29:08,000 --> 00:29:10,000
Or is it just me?

470
00:29:10,000 --> 00:29:14,000
Although the bench test may have proven the bed liner successful...

471
00:29:14,000 --> 00:29:16,000
Doesn't look like there was any penetration.

472
00:29:16,000 --> 00:29:20,000
RoboChomp is a far cry from an angry attack dog.

473
00:29:20,000 --> 00:29:22,000
Good dog! Good boy!

474
00:29:22,000 --> 00:29:24,000
Look at him, he's like a piss.

475
00:29:24,000 --> 00:29:26,000
He's like, you want to go again?

476
00:29:26,000 --> 00:29:28,000
Not really. I don't.

477
00:29:28,000 --> 00:29:30,000
I'm not going to lie.

478
00:29:30,000 --> 00:29:33,000
All right, it's the moment of truth.

479
00:29:33,000 --> 00:29:38,000
With the control complete, it's time for Tori to make his bed liner debut.

480
00:29:38,000 --> 00:29:40,000
Wow, that is the height of fashion, my man.

481
00:29:40,000 --> 00:29:42,000
Well, thank you, friend.

482
00:29:42,000 --> 00:29:44,000
Um, does it close up?

483
00:29:44,000 --> 00:29:47,000
Um, well, the problem is...

484
00:29:47,000 --> 00:29:49,000
Ha ha ha!

485
00:29:49,000 --> 00:29:52,000
I think I put on a little weight with these pants.

486
00:29:52,000 --> 00:29:55,000
Bring out the dog. Let's get this over with.

487
00:29:55,000 --> 00:29:56,000
Grab me on.

488
00:29:56,000 --> 00:30:00,000
With Tori squeezed into the jacket, it's the moment of truth.

489
00:30:00,000 --> 00:30:03,000
This seems like the opposite of a good idea.

490
00:30:03,000 --> 00:30:05,000
And I hope this suit works.

491
00:30:05,000 --> 00:30:08,000
Get that bed liner. Get the bed liner.

492
00:30:08,000 --> 00:30:11,000
Okay, this is bed liner jacket.

493
00:30:11,000 --> 00:30:14,000
Is it dog bite proof or not?

494
00:30:14,000 --> 00:30:16,000
Boss!

495
00:30:16,000 --> 00:30:19,000
The boy, boss! Yeah, boss, boss, boss, boss!

496
00:30:19,000 --> 00:30:21,000
Oh, boy!

497
00:30:21,000 --> 00:30:23,000
It stopped it. That was incredible.

498
00:30:23,000 --> 00:30:26,000
Else, lads!

499
00:30:26,000 --> 00:30:32,000
Amazingly, it's just seconds before Cliff realizes that he won't get his man.

500
00:30:32,000 --> 00:30:35,000
The bed liner is too tough.

501
00:30:35,000 --> 00:30:37,000
That was incredible.

502
00:30:37,000 --> 00:30:40,000
It stopped the dog from biting through the jacket.

503
00:30:40,000 --> 00:30:44,000
Oh, my God, I never want to get bit by one of those for real.

504
00:30:44,000 --> 00:30:46,000
Boss!

505
00:30:46,000 --> 00:30:48,000
We've had dogs attack us wearing these suits,

506
00:30:48,000 --> 00:30:50,000
but these are rated for dog attacks.

507
00:30:50,000 --> 00:30:53,000
They're designed so that you don't get hurt.

508
00:30:53,000 --> 00:30:55,000
However, this has never been rated.

509
00:30:55,000 --> 00:31:00,000
So I had no idea whether or not the dog's teeth were going to tear through this or not.

510
00:31:00,000 --> 00:31:05,000
It worked! It stopped the dog attack.

511
00:31:05,000 --> 00:31:07,000
We have a dog bite proof.

512
00:31:07,000 --> 00:31:09,000
I call this one confirmed.

513
00:31:09,000 --> 00:31:11,000
What's worse, bark of the bite.

514
00:31:11,000 --> 00:31:13,000
The bite.

515
00:31:37,000 --> 00:31:43,000
I'm going to be using this experiment from a thousand feet away in the safety of this steel bunker behind bullet resistant glass.

516
00:31:43,000 --> 00:31:50,000
When I click this switch, it'll open this valve and allow the methane to flow into our homemade sewer buried underground.

517
00:31:50,000 --> 00:31:57,000
When the stoichiometry or the mixture between gas and air has reached the ideal relationship for an explosion,

518
00:31:57,000 --> 00:32:01,000
I'll hit this switch creating a spark which will ignite the gas.

519
00:32:01,000 --> 00:32:05,000
Hopefully sending these three manhole covers flying sky high.

520
00:32:05,000 --> 00:32:07,000
That's the theory.

521
00:32:07,000 --> 00:32:13,000
Because if the 103 pound manholes don't fly sky high, the myth is busted.

522
00:32:13,000 --> 00:32:16,000
What we need to see for this myth to be true is pretty straightforward.

523
00:32:16,000 --> 00:32:23,000
We need to see some type of shock wave or explosion that does not destroy the sewer and yet launches the manhole covers.

524
00:32:23,000 --> 00:32:25,000
And I'm not talking like a boonk boonk.

525
00:32:25,000 --> 00:32:27,000
I'm not even talking like a boonk boonk.

526
00:32:27,000 --> 00:32:30,000
I'm talking launches them.

527
00:32:30,000 --> 00:32:37,000
Well with the fire department on standby, there's only one way to find out if those manholes will fly.

528
00:32:37,000 --> 00:32:39,000
You ready? I'm going to start the flow of gas.

529
00:32:39,000 --> 00:32:41,000
Let her rip.

530
00:32:41,000 --> 00:32:47,000
It will take a hundred cubic feet of methane to get their sewer to the optimum explosive ratio.

531
00:32:47,000 --> 00:32:49,000
Twenty one cubic feet.

532
00:32:49,000 --> 00:32:51,000
About two percent.

533
00:32:51,000 --> 00:32:53,000
One fifth of the way there.

534
00:32:53,000 --> 00:32:56,000
It's that familiar myth busters waiting game.

535
00:32:56,000 --> 00:32:59,000
That sewer is getting pretty full of methane.

536
00:32:59,000 --> 00:33:05,000
Small scale proved that the perfect stoichiometric ratio sent manholes flying.

537
00:33:05,000 --> 00:33:11,000
However, will the full scale equivalent, 100 cubic feet of methane, prove just as effective?

538
00:33:11,000 --> 00:33:12,000
Shall we do it?

539
00:33:12,000 --> 00:33:13,000
I think it's time.

540
00:33:13,000 --> 00:33:15,000
Alright, call it.

541
00:33:15,000 --> 00:33:25,000
Alright, real world sewer explosion, best case scenario, sparking in three, two, one.

542
00:33:29,000 --> 00:33:34,000
Wow, look at that.

543
00:33:34,000 --> 00:33:36,000
That had to be a hundred feet.

544
00:33:36,000 --> 00:33:40,000
That was insane.

545
00:33:40,000 --> 00:33:44,000
That exceeded my wildest expectations.

546
00:33:44,000 --> 00:33:47,000
That was, that was significant.

547
00:33:47,000 --> 00:33:49,000
Significant is right.

548
00:33:49,000 --> 00:33:58,000
The manholes turn missile, rocketing a hundred and fifty feet and only returning to earth after a hang time of six seconds.

549
00:33:58,000 --> 00:33:59,000
Take a look.

550
00:33:59,000 --> 00:34:00,000
Alright.

551
00:34:00,000 --> 00:34:05,000
And closer inspection of their sewer as the guys astonished at the force of the explosion.

552
00:34:05,000 --> 00:34:11,000
Well, there's two, there's three and number one seems to have traveled the farthest.

553
00:34:11,000 --> 00:34:14,000
That is one hell of a blast.

554
00:34:14,000 --> 00:34:18,000
I think the whole riff of the sewer came up.

555
00:34:18,000 --> 00:34:21,000
Well, as I'm walking on it, I can feel it feels soft.

556
00:34:21,000 --> 00:34:22,000
Do you feel that?

557
00:34:22,000 --> 00:34:23,000
That's what I'm saying.

558
00:34:23,000 --> 00:34:26,000
All this dirt kind of came up in the air or a foot or something.

559
00:34:26,000 --> 00:34:27,000
We should check our high speed.

560
00:34:27,000 --> 00:34:29,000
That was awesome.

561
00:34:29,000 --> 00:34:30,000
Yep.

562
00:34:30,000 --> 00:34:37,000
And from the safety of solid ground, the high speed shows that the deflagration of the sewer sent earth and manholes flying.

563
00:34:37,000 --> 00:34:38,000
There they go.

564
00:34:38,000 --> 00:34:42,000
Wow, it's perfect.

565
00:34:42,000 --> 00:34:44,000
They look like flying saucers taken off.

566
00:34:44,000 --> 00:34:47,000
Look at number two showing it to the camera.

567
00:34:47,000 --> 00:34:51,000
That is insane.

568
00:34:51,000 --> 00:34:54,000
That might be one of my favorite high speed shots we've ever gotten.

569
00:34:54,000 --> 00:34:55,000
That's gorgeous.

570
00:34:55,000 --> 00:34:56,000
Gorgeous.

571
00:34:56,000 --> 00:34:59,000
And also very revealing.

572
00:34:59,000 --> 00:35:06,000
Now, seeing fire coming out of that manhole cover and not the others is telling us that this is not a detonation.

573
00:35:06,000 --> 00:35:09,000
If it was a detonation, it all would be simultaneous.

574
00:35:09,000 --> 00:35:12,000
We're not seeing that, so this is a burn.

575
00:35:12,000 --> 00:35:20,000
Yep, but a burn big and fast enough to bring the manhole mayhem to a close.

576
00:35:20,000 --> 00:35:23,000
Well, there's one thing everyone knows they can expect from a sewer explosion.

577
00:35:23,000 --> 00:35:26,000
It's that number two is going to fly into the air.

578
00:35:26,000 --> 00:35:27,000
And that's what happened.

579
00:35:27,000 --> 00:35:30,000
I'd say mission accomplished.

580
00:35:30,000 --> 00:35:32,000
You know what kind of makes you wonder?

581
00:35:32,000 --> 00:35:39,000
Could you get a jet of fire like that coming out of the toilet when you're sitting on it if something like that happened?

582
00:35:39,000 --> 00:35:41,000
Man, that was awesome.

583
00:35:41,000 --> 00:35:43,000
We got a super fast burn.

584
00:35:43,000 --> 00:35:50,000
We got internal pressures in the sewer of over 100 pounds per square inch, and our manhole covers flew 150 feet in the air.

585
00:35:50,000 --> 00:35:52,000
Yeah, and that wasn't even a detonation.

586
00:35:52,000 --> 00:35:55,000
Imagine what would happen if the flame front and the shock wave got all lined up.

587
00:35:55,000 --> 00:35:58,000
Everything happens at once, and who knows how high they'd go.

588
00:35:58,000 --> 00:36:02,000
Still, we have plenty of information to fully call this myth.

589
00:36:02,000 --> 00:36:04,000
Yep, it's confirmed.

590
00:36:04,000 --> 00:36:05,000
Totally confirmed.

591
00:36:05,000 --> 00:36:09,000
Sometimes the truth is far more spectacular than fiction.

592
00:36:13,000 --> 00:36:16,000
Next, Carri-Torre and Grant have a blast.

593
00:36:16,000 --> 00:36:19,000
I like our C4 modeling.

594
00:36:19,000 --> 00:36:22,000
But can bedliner save Buster?

595
00:36:28,000 --> 00:36:31,000
Final experiment for bedliner bedlam.

596
00:36:31,000 --> 00:36:33,000
The bomb.

597
00:36:33,000 --> 00:36:36,000
If you coat your house in bedliner, you can make it blastproof.

598
00:36:36,000 --> 00:36:37,000
Alright, here's what I'm thinking.

599
00:36:37,000 --> 00:36:38,000
Four walls total.

600
00:36:38,000 --> 00:36:43,000
Two Cinder Block walls, one coated one not, and two standard wood frame walls, one coated one not.

601
00:36:43,000 --> 00:36:45,000
Then we detonate an explosive, see how the myth stands.

602
00:36:45,000 --> 00:36:48,000
Alright, and then we'll see how strong this stuff really is.

603
00:36:49,000 --> 00:36:53,000
And quick as a flash, they've knocked up those four walls for a test.

604
00:36:53,000 --> 00:36:57,000
So we have two sets of walls, wood ones and Cinder Block ones.

605
00:36:57,000 --> 00:37:02,000
And we're going to see how well the bedliner does against an explosion.

606
00:37:02,000 --> 00:37:05,000
A lot of people ask me, do you ever get tired of blowing stuff up?

607
00:37:05,000 --> 00:37:07,000
I tell them no, I don't.

608
00:37:07,000 --> 00:37:10,000
It'll be a blast times four.

609
00:37:10,000 --> 00:37:13,000
But that's not good news for Buster.

610
00:37:13,000 --> 00:37:16,000
So we've placed Buster right in the middle of our wood frame house.

611
00:37:16,000 --> 00:37:18,000
He's got no instrumentation inside of him.

612
00:37:18,000 --> 00:37:19,000
This is just a visual test.

613
00:37:19,000 --> 00:37:22,000
We want to see if the walls fall in on him.

614
00:37:22,000 --> 00:37:26,000
Now on this side of the wall, I'm setting up the blast.

615
00:37:26,000 --> 00:37:29,000
C4 is exactly five feet away from the center of the wall.

616
00:37:29,000 --> 00:37:35,000
When this thing explodes, it's going to be putting out a blast load of 95 PSI.

617
00:37:35,000 --> 00:37:38,000
Let's see how the wood wall handles it.

618
00:37:38,000 --> 00:37:40,000
Okay, this is control test for bedliner.

619
00:37:40,000 --> 00:37:41,000
Here we go.

620
00:37:41,000 --> 00:37:44,000
Three, two, one.

621
00:37:48,000 --> 00:37:51,000
Oh, hold on that wall.

622
00:37:51,000 --> 00:37:54,000
Oh yeah, like I can see Buster.

623
00:37:54,000 --> 00:37:59,000
He's all black and Cajun Buster.

624
00:37:59,000 --> 00:38:06,000
Unsurprisingly, the code-compliant wooden wall between Buster and the C4 failed.

625
00:38:06,000 --> 00:38:08,000
Looks like we just put a new door in.

626
00:38:08,000 --> 00:38:10,000
I like our C4 modeling.

627
00:38:10,000 --> 00:38:14,000
Now if this bedliner has any hope of working at all,

628
00:38:14,000 --> 00:38:20,000
what it's got to do is contain most, if not all of us, and keep it from hitting Buster.

629
00:38:20,000 --> 00:38:21,000
My prediction?

630
00:38:21,000 --> 00:38:22,000
I don't think so.

631
00:38:22,000 --> 00:38:25,000
Well, to find out its relocation relocation.

632
00:38:25,000 --> 00:38:29,000
As Buster is moved to an identical wooden home.

633
00:38:29,000 --> 00:38:30,000
Good luck Buster.

634
00:38:30,000 --> 00:38:31,000
You're going to need it.

635
00:38:31,000 --> 00:38:34,000
All except the coating of bedliner.

636
00:38:34,000 --> 00:38:36,000
Now for the bedliner house.

637
00:38:36,000 --> 00:38:41,000
Same amount of C4, same distance.

638
00:38:41,000 --> 00:38:44,000
All right, this is Woodwall with bedliner versus C4.

639
00:38:44,000 --> 00:38:45,000
Do it.

640
00:38:45,000 --> 00:38:48,000
In three, two, one.

641
00:38:50,000 --> 00:38:53,000
And smoke clears and still standing.

642
00:38:53,000 --> 00:38:56,000
Wow, the wall is still together.

643
00:38:56,000 --> 00:38:58,000
All right, but we got to check the inside.

644
00:38:58,000 --> 00:38:59,000
Let's go look, let's go look.

645
00:38:59,000 --> 00:39:01,000
It worked baby.

646
00:39:05,000 --> 00:39:08,000
It stopped the shockwave from breaking through the wall.

647
00:39:08,000 --> 00:39:09,000
That's incredible.

648
00:39:09,000 --> 00:39:11,000
This is in remarkably good shape.

649
00:39:11,000 --> 00:39:13,000
All right, well it's blastproof from the outside.

650
00:39:13,000 --> 00:39:14,000
Let's check the inside.

651
00:39:20,000 --> 00:39:23,000
I would have to say this is totally blastproof.

652
00:39:24,000 --> 00:39:28,000
Amazingly the coated wooden walls are indeed bombproof.

653
00:39:28,000 --> 00:39:33,000
But can bedliner hold the C4 wolf away for the cinder blocks?

654
00:39:33,000 --> 00:39:35,000
Now we are moving on to the cinder block wall,

655
00:39:35,000 --> 00:39:37,000
but we are going to double the amount of C4.

656
00:39:37,000 --> 00:39:40,000
The reason is because the amount that we use on the woodwalls

657
00:39:40,000 --> 00:39:43,000
would not do any damage to the cinder block wall.

658
00:39:43,000 --> 00:39:47,000
All in all, it's just another brick in the wall.

659
00:39:47,000 --> 00:39:51,000
And in doing so, we are also increasing the amount of blast load

660
00:39:51,000 --> 00:39:54,000
from 95 PSI to 1400 PSI.

661
00:39:54,000 --> 00:39:57,000
We're going to set off C4 in front of both walls

662
00:39:57,000 --> 00:39:59,000
and see what happens.

663
00:39:59,000 --> 00:40:02,000
So first to find out what double the C4 does

664
00:40:02,000 --> 00:40:04,000
to their cinder block control.

665
00:40:04,000 --> 00:40:07,000
In three, two, one.

666
00:40:12,000 --> 00:40:13,000
Yeah!

667
00:40:13,000 --> 00:40:14,000
I see a hole.

668
00:40:20,000 --> 00:40:23,000
Wow, it blew the whole back out.

669
00:40:25,000 --> 00:40:27,000
It bowed just like the woodwall,

670
00:40:27,000 --> 00:40:29,000
but it pushed all the bricks out of the mortar.

671
00:40:29,000 --> 00:40:33,000
And I would have to say Buster probably didn't survive this blast.

672
00:40:33,000 --> 00:40:36,000
All right, well, let's see what the bedliner does.

673
00:40:36,000 --> 00:40:38,000
Okay, that was pretty impressive.

674
00:40:38,000 --> 00:40:44,000
For the ultimate test of bedliner, Buster has his back to the reinforced wall.

675
00:40:44,000 --> 00:40:48,000
But will it be enough to protect him from a C4 blast?

676
00:40:48,000 --> 00:40:51,000
This is bedliner on a cinder block wall.

677
00:40:51,000 --> 00:40:54,000
In three, two, one.

678
00:40:58,000 --> 00:41:00,000
I see smoke rising and...

679
00:41:00,000 --> 00:41:03,000
...it left a big black mark, but I don't think it did any damage to it.

680
00:41:03,000 --> 00:41:05,000
I don't see a hole.

681
00:41:06,000 --> 00:41:09,000
From the front, it's looking good for blast-proof bedliner.

682
00:41:09,000 --> 00:41:11,000
Guys, it's looking really good from this side.

683
00:41:11,000 --> 00:41:14,000
Yeah, there's hardly any damage. It's just dirt.

684
00:41:14,000 --> 00:41:16,000
Well, let's look at the other side.

685
00:41:16,000 --> 00:41:17,000
What?!

686
00:41:19,000 --> 00:41:20,000
It worked!

687
00:41:20,000 --> 00:41:22,000
Buster survived!

688
00:41:31,000 --> 00:41:33,000
So, bedliner is blast-proof.

689
00:41:33,000 --> 00:41:36,000
Totally blast-proof. This one's confirmed.

690
00:41:37,000 --> 00:41:41,000
So, as it turns out, bedliner has amazing blast-proofing qualities.

691
00:41:41,000 --> 00:41:43,000
We sprayed it on our wood wall here.

692
00:41:43,000 --> 00:41:45,000
It kept the wall together.

693
00:41:45,000 --> 00:41:47,000
It kept it from showering Buster with debris.

694
00:41:48,000 --> 00:41:52,000
Now, here with our cinder block wall, it totally devastated the back of the wall.

695
00:41:52,000 --> 00:41:55,000
Crumbled everything. Debris everywhere.

696
00:41:55,000 --> 00:41:59,000
And here on our treated cinder block wall, not a scratch on it.

697
00:42:00,000 --> 00:42:02,000
Bedliner as a blast-proofing agent?

698
00:42:02,000 --> 00:42:03,000
Confirmed.

699
00:42:03,000 --> 00:42:05,000
That's incredible, man!

700
00:42:05,000 --> 00:42:07,000
Wow, we've got a new application for bedliner, huh?

701
00:42:07,000 --> 00:42:08,000
That's awesome stuff.

702
00:42:08,000 --> 00:42:10,000
What else could we do with it?

703
00:42:10,000 --> 00:42:12,000
I don't know. Let's see if we can make stuff bulletproof.

704
00:42:12,000 --> 00:42:14,000
What about shark proof?

705
00:42:14,000 --> 00:42:15,000
What about bear proof?

706
00:42:30,000 --> 00:42:32,000
Buster's Aftershow