Underground Worlds
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Original version
Seasons 1 & 2
Underground Marvels
10 episodes
1. Hotel Bunker of the Apocalypse
1. Hotel Bunker of the Apocalypse
Experts reveal how a nuclear bunker was concealed under a palatial hotel.
42min
Aug 4, 2021
2. Mystery of the Kentucky Cave
2. Mystery of the Kentucky Cave
Experts unearth a mystery from the longest known cave system in the world.
42min
Aug 11, 2021
3. Cincinnati's Secret Caverns
3. Cincinnati's Secret Caverns
Experts investigate deserted caverns beneath the streets of Cincinnati.
41min
Aug 18, 2021
4. Buried Lab of the Black Hills
4. Buried Lab of the Black Hills
Experts investigate a cutting-edge underground laboratory in South Dakota.
42min
Aug 25, 2021
5. Ireland's Underground Alcatraz
5. Ireland's Underground Alcatraz
Experts reveal how an Irish military fortress transformed into a prison.
42min
Sep 1, 2021
6. Subterranean Silo Survival
6. Subterranean Silo Survival
Experts investigate a decommissioned underground missile launch facility.
42min
Sep 8, 2021
7. Italy's Subterranean Secret
7. Italy's Subterranean Secret
Experts explore a subterranean world discovered beneath an Italian city.
42min
Sep 15, 2021
8. Grand Canyon's Lost Treasure
8. Grand Canyon's Lost Treasure
Experts explore the largest dry cave system in North America.
41min
Sep 22, 2021
9. Murder Raid Tunnels
9. Murder Raid Tunnels
Experts explore an extensive network of tunnels beneath Ramsgate, England.
41min
Sep 29, 2021
10. Medieval Maze of Secrets
10. Medieval Maze of Secrets
Experts investigate medieval tunnels beneath the town of Exeter, England.
42min
Oct 6, 2021
More versions available
2019
