Enormous manmade caves, unexplainable structures, and underwater discoveries that challenge everything we know about the past. Is it possible that an advanced civilization inhabited Earth thousands of years ago? See more in Season 10, Episode 1, "Aliens B.C."
Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule.
"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.
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