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Secrets of the Underground

  • 2017
  • Season 1
  • 8 episodes
  • Entertainment

Summary

Sprawling subterranean worlds live right below our feet; bizarre phenomena and histories long thought lost lie waiting to be uncovered. Emmy Award-winning explorer and ecologist Rob Nelson goes digging to unearth these fascinating archeological and architectural enigmas.

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Episode 2: Secrets Underground: Mystery of the Serpent Mound

Summary

Rob Nelson investigates mysterious tunnels under Denver's airport, then heads to Ohio to uncover the secrets of a giant serpent-shaped mound.

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