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9:00 PM: Secrets Of The Underground (S1 E2) (S1) | Discovery Channel | 1/12 2026 Discovery Channel
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Secrets Of The Underground « at 9:00 PM on Discovery Channel

Episode 2

Broadcast info
Published: 2017
Episode: Mystery Of The Serpent Mound

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

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