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Where to watch "Underground Marvels"
10. Medieval Maze of Secrets
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A forgotten world of ancient underground passages and medieval engineering lies hidden beneath the town of Exeter, England; experts investigate and reveal how this ambitious tunnel system was the result of one of the deadliest epidemics in history.
9. Murder Raid Tunnels
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Hidden beneath the town of Ramsgate, England, lies a hidden network of over three miles of air raid tunnels; experts investigate and uncover an extensive WWII bomb shelter that became a permanent refuge for many civilians after a devastating attack.
8. Grand Canyon's Lost Treasure
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Descending more than 200 feet beneath the Arizona bedrock lies the largest dry cave system in North America, and now, experts explore this vast subterranean network to reveal the mysteries and undiscovered treasure that remain hidden within its walls.
7. Italy's Subterranean Secret
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An unprecedented landslide unveils a hidden world beneath a picturesque town in northern Italy, and now, experts investigate this vast network of tunnels and passageways stretched 300 feet underground to reveal the city's subterranean past.
6. Subterranean Silo Survival
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Experts investigate a decommissioned underground missile launch facility.
5. Ireland's Underground Alcatraz
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Subterranean military fortresses situated on the southern coast of Ireland have protected against enemy invasion for over 400 years, and now, experts investigate how this powerful stronghold transformed into a brutal and terrifying prison.
4. Buried Lab of the Black Hills
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Experts investigate a cutting-edge underground laboratory in South Dakota.
3. Cincinnati's Secret Caverns
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Deep beneath the streets of Cincinnati lies a network of deserted tunnels and caverns that contain a remarkable history of the city's origins, and now, experts investigate to reveal who built this underground labyrinth and why it was abandoned.
2. Mystery of the Kentucky Cave
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The longest known cave system in the world spans hundreds of miles beneath the wooded hills of Kentucky, and containing prehistoric artifacts and ancient human remains, experts reveal a subterranean mystery that may have changed the course of US history.
1. Hotel Bunker of the Apocalypse
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The top-secret construction of a massive nuclear bunker remained concealed under a palatial West Virginia hotel for decades, and now, experts reveal how this vast subterranean structure was one of the most closely guarded Cold War secrets in US history.
