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Season 2
Episode 1:
Legend of the Nazi Gold
Episode 2:
King Solomon's Treasures
Episode 3:
Tesla's Final Secrets
Episode 4:
Doomsday Volcano of the Gods
Episode 5:
Atlantis in America
Episode 6:
Mystery of the Ice Cave
Episode 7:
Lost Pirate City Treasure
Episode 8:
Quest for the Gold Rush Fortune
Episode 1:
Capone's Escape Tunnels
Episode 2:
Mystery of the Serpent Mound
Episode 3:
America's Buried Massacre
Episode 4:
Rocky Mountain Monsters
Episode 5:
Great Lakes Bermuda Triangle
Episode 6:
California's Hidden Doomsday
Episode 7:
Secret History of the New World
Episode 8:
American Stonehenge
Watch Secrets of the Underground Season 2 Episode 6 Online for Free
Overview:
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.
