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Overview:
Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.
Episode 1:
Hotel Bunker of the Apocalypse
Episode 2:
Mystery of the Kentucky Cave
Episode 3:
Cincinnati's Secret Caverns
Episode 4:
Buried Lab of the Black Hills
Episode 5:
Ireland's Underground Alcatraz
Episode 6:
Subterranean Silo Survival
Episode 7:
Italy's Subterranean Secret
Episode 8:
Grand Canyon's Lost Treasure
Episode 9:
Murder Raid Tunnels
Episode 10:
Medieval Maze of Secrets
Episode 1:
Secrets of the Rock
Episode 2:
Mystery of the Lost Labyrinth
Episode 3:
Secrets of the Terror Tunnels
Episode 4:
The Renegade's Lair
Episode 5:
Cave of the Body Snatchers
Episode 6:
World's Biggest Labyrinth
Episode 7:
Treasures of the Lost Mine
Episode 8:
Ghosts of the Hell Maze
Episode 9:
Conspiracy in the Buried City
Episode 10:
