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Secrets of the Underground: Season 1

1x02 Mystery of the Serpent Mound
TV-PG

  • 2017-02-21T05:00:00Z on Science
  • 1h
  • United States
  • English
  • Reality, Documentary
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.
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