Secrets of the Underground
Secrets of the Underground
720p
2017
4.3
A search for an underground escape route said to have been used by Al Capone. Also: who or what built earthen mounds in Washington state.
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Capone's Escape Tunnels
S1
•
E1
Feb 14, 2017
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Mystery of the Serpent Mound
S1
•
E2
Feb 21, 2017
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America's Buried Massacre
S1
•
E3
Feb 28, 2017
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Rocky Mountain Monsters
S1
•
E4
Mar 7, 2017
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Great Lakes Bermuda Triangle
S1
•
E5
Mar 14, 2017
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California's Hidden Doomsday
S1
•
E6
Mar 21, 2017
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Secret History of the New World
S1
•
E7
Mar 28, 2017
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American Stonehenge
S1
•
E8
Apr 4, 2017
