Secrets Underground

9:00 PM to 10:00 PM
Monday 12 January
+

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 Channel at 9:00 PM, Monday 12 January. (Subtitles.)
Topics