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Some Ancient Astronaut Theorists believe alien life could be found deep within the earth's most mysterious caves in this clip from Season 9, "Forbidden Caves". #AncientAliens
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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.

• Ancient Aliens: Holy Mysteries in Earth's Deepest Caves (Season 9) | History ( Download)
• Ancient Aliens - Holy secrets in the deepest caves ( Download)
• Ancient Aliens: India's Mysterious Caves (Season 9) | History ( Download)
• Ancient Aliens: The Ellora Caves (Season 12) | Exclusive | History ( Download)
• Ancient Aliens: Biblical Encounter Linked to Alien Abduction (Season 5) | History ( Download)
• Ancient Aliens: Lost Tibetan Kingdom Connected to Mysterious UFOs (Season 16) | History ( Download)
• Ancient Aliens: Secret Alien Messages at an Arizona Ranch (Season 18) ( Download)
• In Search Of: Forbidden Secrets of the Bible (S2, E4) | Full Episode ( Download)
• Ancient Aliens: The Easter Island Mystery (Season 13) | History ( Download)
• Ancient Aliens: SECRET ALIEN PLAN TO REUNITE WITH MANKIND (Season 14) | History ( Download)
• Ancient Aliens: The Garden of Eden's Genetic Laboratory (Season 8) | History ( Download)
• Ancient Aliens: Was Noah an Alien (Season 9) | History ( Download)
• Ancient Aliens: The Vittala Temple's Puzzling Pillars (Season 12, Episode 8) | History ( Download)
• Ancient Alien Contact Revealed: Unveiling the Enigma of Sego Canyon Cave Paintings ( Download)
• Ancient Aliens: The Akashic Record (Season 12) | Exclusive | History ( Download)