Ancient Aliens

Season 2 Episode 4

Underground Aliens

Aired Unknown Nov 18, 2010 on The History Channel
9.0
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The lost cities of the world are filled with secrets, and some of them do not seem explicable by any ordinary means. A cave in Ecuador was filled with metallic books that might contain data on an ancient civilization. An underground base in New Mexico continues to be guarded by the military. There may be stuff from the stars buried beneath the ground.

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