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Ancient Aliens: Extraterrestrial Secrets in Earth's Depths (S2, E4) | Full Episode
If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? See more in Season 2, Episode 4, "Underground Aliens." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from ...
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