Ancient Aliens: UFOs Spotted in Antarctica (Special)

The largely unexplored continent of Antarctica has long been subject to rumors of UFOs, underground tunnel networks, and concealed ancient structures, giving rise to speculation about an alien presence beneath its icy surface. Learn more in this clip from Season 2, Episode 6, MYSTERIES BENEATH THE ICE.

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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.