Season 2 Episode
- Season 2 Hotel Bunker of the Apocalypse
- Season 2 Mystery of the Kentucky Cave
- Season 2 Cincinnati's Secret Caverns
- Season 2 Buried Lab of the Black Hills
- Season 2 Ireland's Underground Alcatraz
- Season 2 Subterranean Silo Survival
- Season 2 Italy's Subterranean Secret
- Season 2 Grand Canyon's Lost Treasure
- Season 2 Murder Raid Tunnels
- Season 2 Medieval Maze of Secrets
Underground Marvels - Season 2 Episode 3 Cincinnati's Secret Caverns
6.50 45 minutes 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.
