Admiral’s Byrds Discovery of a Crystal City Under Antarctica

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During an Arctic expedition, naval officer Richard Byrd makes a very unusual discovery, in this clip from Season 18, “Secrets of Inner Earth.” Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient Aliens and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT

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