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Release Date: February 21, 2017
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Secrets of the Underground

SD 2017

Mystery of the Serpent Mound 1 Season 2 Episode

4.3

Rob Nelson explores mysterious tunnels beneath Denver's airport and capitol building to investigate rumors of a secret organization operating below. In Ohio, he tries to uncover the ancient secrets of a mound shaped like a serpent.

Country
United States
Genre
Documentary
Released
14 Feb, 2017

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