Ancient Aliens: ALIEN CIVILIZATIONS ON THE OCEAN FLOOR (Season 14) | History

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A super-suit designed to allow humans to breath liquid air might be the key to exploring undiscovered parts of our sea, according to ancient theorists. But lurking beneath the waves, could there be highly advanced alien civilizations? Find out more in this clip from Season 14, "They Came from the Sea". #AncientAliens
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