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Season 2 Episode
- Season 2 Murder Raid Tunnels
- Season 2 Grand Canyon's Lost Treasure
- Season 2 Cincinnati's Secret Caverns
- Season 2 Hotel Bunker of the Apocalypse
- Season 2 Mystery of the Kentucky Cave
- Season 2 Ireland's Underground Alcatraz
- Season 2 Medieval Maze of Secrets
- Season 2 Buried Lab of the Black Hills
- Season 2 Subterranean Silo Survival
- Season 2 Italy's Subterranean Secret
Underground Worlds - Season 2 Episode 1 Murder Raid Tunnels
8.00 45 minutes Exploring the extensive air raid tunnels hidden beneath Ramsgate. Also, how the former thriving mining town of Butte, Montana repurposed the 10,000 miles of tunnels.
