Secrets Underground

7:00 PM to 8:00 PM
Sunday 1 December
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Mystery of the Serpent Mound

Season 1 Episode 2 of 8

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

Secrets Underground airs on Discovery History at 7:00 PM, Sunday 1 December. (Subtitles.)
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