Is there evidence of extraterrestrial life in our oceans? See more in this compilation from Ancient Aliens.
00:00 - Secret Underwater Alien Base Found
08:59 - Alien Life in the Ocean
14:34 - Lost Island Discovered in North Atlantic
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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.
HISTORY® is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s all-original programming slate features a roster of hit series, premium documentaries, and scripted event programming.