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Ancient Aliens
Series 2 Episode 4: Underground AliensIf 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?
- Category
- Documentary / History / Paranormal
- Original air date
- 2010-11-18
Cast and crew