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  • S2.E1 ∙ Hotel Bunker of the Apocalypse
  • S2.E2 ∙ Mystery of the Kentucky Cave
  • S2.E3 ∙ Cincinnati's Secret Caverns
  • S2.E4 ∙ Buried Lab of the Black Hills
  • S2.E5 ∙ Ireland's Underground Alcatraz
  • S2.E6 ∙ Subterranean Silo Survival
  • S2.E7 ∙ Italy's Subterranean Secret
  • S2.E8 ∙ Grand Canyon's Lost Treasure
  • S2.E9 ∙ Murder Raid Tunnels
  • S2.E10 ∙ Medieval Maze of Secrets