$19.99
Other seasons
Available on
HoloLens
PC
Mobile device
Xbox 360
Description
For centuries, people have built mind-blowing structures underground. This series reveals these incredible feats of human endeavor and reveals what people have built, where they've built it, how, and why.
Episodes
1. Hotel Bunker of the Apocalypse
42 min
8/5/2021
2. Mystery of the Kentucky Cave
42 min
8/13/2021
3. Cincinnati's Secret Caverns
41 min
8/20/2021
4. Buried Lab of the Black Hills
42 min
8/27/2021
5. Ireland's Underground Alcatraz
42 min
9/3/2021
6. Subterranean Silo Survival
42 min
9/9/2021
7. Italy's Subterranean Secret
42 min
9/17/2021
8. Grand Canyon's Lost Treasure
41 min
9/24/2021
9. Murder Raid Tunnels
41 min
10/1/2021
10. Medieval Maze of Secrets
42 min
10/8/2021