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Series
Underground Marvels
GB
Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.
Seasons & Episodes
E1
Secrets of the Rock
2019-10-17
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E2
Mystery of the Lost Labyrinth
2019-10-24
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E3
Secrets of the Terror Tunnels
2019-10-31
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E4
The Renegade's Lair
2019-11-07
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E5
Cave of the Body Snatchers
2019-11-14
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E6
World's Biggest Labyrinth
2019-11-21
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E7
Treasures of the Lost Mine
2019-12-05
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E8
Ghosts of the Hell Maze
2019-12-12
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E9
Conspiracy in the Buried City
2019-12-19
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E10
Curse of Cannibal Caves
2019-12-26
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E1
Hotel Bunker of the Apocalypse
2021-08-05
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E2
Mystery of the Kentucky Cave
2021-08-12
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E3
Cincinnati's Secret Caverns
2021-08-19
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E4
Buried Lab of the Black Hills
2021-08-26
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E5
Ireland's Underground Alcatraz
2021-09-02
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E6
Subterranean Silo Survival
2021-09-09
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E7
Italy's Subterranean Secret
2021-09-16
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E8
Grand Canyon's Lost Treasure
2021-09-23
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E9
Murder Raid Tunnels
2021-09-30
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E10
Medieval Maze of Secrets
2021-10-07
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Production
