S2·E4 Underground Aliens
Synopsis
If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? Could a cave in Ecuador contain metallic books inscribed with secrets of alien technology? Was an ancient underground city in Turkey built with alien help... or as a refuge from an alien attack? Rumors of the U.S. military working alongside aliens in a secret base inside a mesa in New Mexico continue to swirl, Native American legends mention strange inner-Earth beings, and recent archaeological discoveries in the Yucatan may point to an extraterrestrial reality behind.
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Frequently Asked Questions
When did Season 2 Episode 4 of Ancient Aliens air?
Season 2, Episode 4 ('Underground Aliens') originally aired on November 18, 2010.
How long is Season 2 Episode 4 ('Underground Aliens')?
The episode follows the standard broadcast runtime for Ancient Aliens.
What happens in Ancient Aliens Season 2 Episode 4?
If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? Could a cave in Ecuador contain metallic books inscribed with secrets of alien technology? Was an ancient underground city in Turkey built with alien help... or as ...