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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