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Hollow Earth: Breathtaking pictures
TalkieWalkie
Location: District of Chihuahua, Mexico. The Naica Mines.
More pictures
http://www.abovetopsecret.com/forum/thread592042/pg1
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Comments
mike65
Looks like set in the opening of the 1978 Superman film.
TalkieWalkie
Sure is, first thing I thought too. Hard to imagine how they are formed, unlike Stalactites and Stalagmites. Incredible