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Allard Beutel/STS-133 Tanking Commentator: This is Shuttle Launch Control

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at NASA's Kennedy Space Center in Florida.

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We have officially scrubbed today's launch attempt for space shuttle Discovery's

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STS-133 mission to the International Space Station.

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The official scrub time was 8:11 a.m. Eastern.

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The launch team here in Firing Room 4 in the Launch Control Center is currently in the process of draining the

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External Tank of both the liquid oxygen and liquid hydrogen.

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And that is because a hydrogen gas leak developed roughly about an hour ago during the process known as tanking,

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that's filling the External Tank with about 535,000 gallons of liquid hydrogen and liquid oxygen.

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The leak occurred in a location known as the Ground Umbilical Carrier Plate, or GUCP.

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It's a connecting plate, you see here, in a ventilation line that bleeds off excess hydrogen gas

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as the liquid hydrogen part of the tank is filling up.

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Come back on with an update but we are officially scrubbed today and not going to be trying to launch this afternoon.