Underground Marvels - Season 2

Underground Marvels - Season 2

Season 2

Network
Episodes10
DatesAug. 5, 2021 - Okt. 7, 2021
Previous Season

Episodes

Hotel Bunker of the Apocalypse
Season 2Episode 160 min

Hotel Bunker of the Apocalypse

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.

Aug. 5, 2021
Mystery of the Kentucky Cave
Season 2Episode 260 min

Mystery of the Kentucky Cave

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.

Aug. 12, 2021
Cincinnati's Secret Caverns
Season 2Episode 360 min

Cincinnati's Secret Caverns

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.

Aug. 19, 2021
Buried Lab of the Black Hills
Season 2Episode 460 min

Buried Lab of the Black Hills

Buried nearly a mile beneath the Black Hills of South Dakota is a cutting-edge laboratory at the forefront of astonishing scientific research, and now, experts reveal advancements engineers achieved more than a century ago that keep it operating today.

Aug. 26, 2021
Ireland's Underground Alcatraz
Season 2Episode 560 min

Ireland's Underground Alcatraz

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.

Sept. 2, 2021
Subterranean Silo Survival
Season 2Episode 660 min

Subterranean Silo Survival

A decommissioned missile launch facility in Kansas remained one of the best kept subterranean military secrets of the Cold War, and now, experts reveal how this abandoned underground complex transformed into a state-of-the-art survival bunker.

Sept. 9, 2021
Italy's Subterranean Secret
Season 2Episode 760 min

Italy's Subterranean Secret

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 that stretch 300 feet underground to reveal the city's subterranean past.

Sept. 16, 2021
Grand Canyon's Lost Treasure
Season 2Episode 860 min

Grand Canyon's Lost Treasure

Descending more than 200 feet beneath the Arizona bedrock lies the largest dry cave system in North America; experts explore this vast subterranean network to reveal the mysteries and undiscovered treasure that remain hidden within its walls.

Sept. 23, 2021
Murder Raid Tunnels
Season 2Episode 960 min

Murder Raid Tunnels

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.

Sept. 30, 2021
Medieval Maze of Secrets
Season 2Episode 1060 min

Medieval Maze of Secrets

A forgotten world of ancient underground passages and medieval engineering lies hidden beneath Exeter, England; experts investigate and reveal how this ambitious tunnel system resulted from one of the deadliest epidemics in history.

Okt. 7, 2021

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