While you are soaking in your vat Carl, here is a little light reading for you.

The Hollow Moon

"A theory that suggests that the moon is a large hollow sphere...originated during
seismological tests on the moon following the Lunar landings.

This occured most notably in November 1969 after seismometers were set up on the
moons surface by the astronauts of Apollo XII. When the Lunar module had taken off,
heading back to earth the astronauts discarded the ascent stage of the lunar module,
dropping it on the moons surface, smashing the craft and creating a tremor that was
picked up by the seismometers and when the NASA scientists heard the data stream,
they couldn't believe what they were hearing. The moon was ringing like a bell and
continued to do so for around an hour.

After they had had a chance to analyse the seismological information, NASA declared
that the moon seemed to be a hollow sphere with a metallic layer around 34-40 metres
deep."
http://www.unexplained-mysteries.com/articlehollowmoon.shtml