2 - 1Hotel Bunker of the Apocalypse Aug. 05, 2021- 2 - 2Mystery of the Kentucky Cave Aug. 12, 2021
- 2 - 3Cincinnati's Secret Caverns Aug. 19, 2021
- 2 - 4Buried Lab of the Black Hills Aug. 26, 2021
- 2 - 5Ireland's Underground Alcatraz Sep. 02, 2021
- 2 - 6Subterranean Silo Survival Sep. 09, 2021
- 2 - 7Italy's Subterranean Secret Sep. 16, 2021
- 2 - 8Grand Canyon's Lost Treasure Sep. 23, 2021
- 2 - 9Murder Raid Tunnels Sep. 30, 2021
- 2 - 10Medieval Maze of Secrets Oct. 07, 2021
