Season 2
(2021)
Cast
Episodes
Hotel Bunker of the Apocalypse 0.0
August 5, 2021
The top-secret construction of a massive nuclear bunker remained concealed under a palatial West Virginia hotel for dec…
Mystery of the Kentucky Cave 0.0
August 12, 2021
The longest known cave system in the world spans hundreds of miles beneath the hills of Kentucky, and containing prehis…
Cincinnati's Secret Caverns 0.0
August 19, 2021
Deep beneath the streets of Cincinnati lies a network of deserted tunnels and caverns that contain a remarkable history…
Buried Lab of the Black Hills 0.0
August 26, 2021
Buried nearly a mile beneath the Black Hills of South Dakota is a cutting-edge laboratory at the forefront of astonishi…
Ireland's Underground Alcatraz 0.0
September 2, 2021
Subterranean military fortresses situated on the southern coast of Ireland have protected against enemy invasion for ov…
Subterranean Silo Survival 0.0
September 9, 2021
Experts investigate a decommissioned underground missile launch facility.
Italy's Subterranean Secret 0.0
September 16, 2021
An unprecedented landslide unveils a hidden world beneath a picturesque town in northern Italy, and now experts investi…
Grand Canyon's Lost Treasure 0.0
September 23, 2021
Descending more than 200 feet beneath the Arizona bedrock lies the largest dry cave system in North America; experts ex…
Murder Raid Tunnels 0.0
September 30, 2021
Experts explore an extensive network of tunnels beneath Ramsgate, England.
Medieval Maze of Secrets 0.0
October 7, 2021
A forgotten world of ancient underground passages and medieval engineering lies hidden beneath the town of Exeter, Engl…