Ancient Aliens: Terrifying Humanoids Emerge from Subterranean Realm (Season 18) | History

A new subterranean realm is discovered deep in the caves of Vietnam, in this clip from Season 18, "Secrets of Inner Earth."

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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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Ancient Aliens: Terrifying Humanoids Emerge from Subterranean Realm (Season 18) | History
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