The MOST PUZZLING Mysteries of the Deep Ocean
Ancient Aliens: Top 3 Otherworldly Deep Ocean Mysteries (S19)

Could these underwater mysteries provide a record of extraterrestrial visitation? Find out in this clip from Season 19, Episode 19, The Top Ten Mysteries of the Deep. Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...

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