Underground Marvels Season 2 Episode 2
Mystery of the Kentucky Cave
The longest known cave system in the world spans hundreds of miles beneath the hills of Kentucky, and containing prehistoric artifacts and ancient human remains, experts reveal a subterranean mystery that may have changed the course of U.S. history.
2 - 10Medieval Maze of SecretsOct. 08, 2021- 2 - 9Murder Raid TunnelsSep. 30, 2021
- 2 - 8Grand Canyons Lost TreasureSep. 23, 2021
- 2 - 7Italy's Subterranean SecretSep. 16, 2021
- 2 - 6Subterranean Silo SurvivalSep. 09, 2021
- 2 - 5Ireland's Underground AlcatrazSep. 02, 2021
- 2 - 4Buried Lab of the Black HillsAug. 26, 2021
- 2 - 3Cincinnati's Secret CavernsAug. 19, 2021
- 2 - 2Mystery of the Kentucky CaveAug. 12, 2021
- 2 - 1Hotel Bunker of the ApocalypseAug. 05, 2021
