Season
- Season 2 2022-01-10
- Season 1 2019-09-25
Episode
- Episode 1: Murder Raid Tunnels
- Episode 2: Grand Canyon's Lost Treasure
- Episode 3: Cincinnati's Secret Caverns
- Episode 4: Hotel Bunker of the Apocalypse
- Episode 5: Mystery of the Kentucky Cave
- Episode 6: Ireland's Underground Alcatraz
- Episode 7: Medieval Maze of Secrets
- Episode 8: Buried Lab of the Black Hills
- Episode 9: Subterranean Silo Survival
- Episode 10: Italy's Subterranean Secret
Underground Worlds
8/10 users British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why.
