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What "Ancient Aliens" 4-th episode about
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?
Episode number: 4
Episode name: "Underground Aliens"
Episode release date: 19 november 2010 at 03:00
Status: aired
Rating: 7.2