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Secrets of the Undergroundchevron_right

S01E02: Mystery of the Serpent Mound
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.
Genres:
Reality
Air Date:
Feb 21, 2017
Runtime:
60 minutes
Casts:
Secrets of the Underground
Season 1
E1
Capone's Escape Tunnels
E2
Mystery of the Serpent Mound
E3
America's Buried Massacre
E4
Rocky Mountain Monsters
E5
Great Lakes Bermuda Triangle
E6
California's Hidden Doomsday
E7
Secret History of the New World
E8
American Stonehenge
Season 2
E1
Legend of the Nazi Gold
E2
King Solomon's Treasures
E3
Tesla's Final Secrets
E4
Doomsday Volcano of the Gods
E5
Atlantis in America
E6
Mystery of the Ice Cave
E7
Lost Pirate City Treasure
E8
Quest for the Gold Rush Fortune
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