S1.E1 ∙ Secrets of the Rock Wed, Oct 16, 2019 A city within the Rock of Gibraltar helped control the seas during WWII. 0 /10
S1.E2 ∙ Mystery of the Lost Labyrinth Wed, Oct 23, 2019 A new excavation hopes to reveal the secrets of the Williamson Tunnels. 0 /10
S1.E3 ∙ Secrets of the Terror Tunnels Wed, Oct 30, 2019 Tunnels built almost 3,000 years ago were used to trap enemies in battle. 0 /10
S1.E4 ∙ The Renegade's Lair Wed, Nov 06, 2019 An infamous nobleman on the run leaves his secrets in a Slovenian cave. 0 /10
S1.E5 ∙ Cave of the Body Snatchers Wed, Nov 13, 2019 Beneath Naples, the ancient Greeks excavated tunnels deep underground. Add to My List 0 /10
S1.E6 ∙ World's Biggest Labyrinth Wed, Nov 20, 2019 Beneath Dover Castle lies an underground world created to thwart Hitler. 0 /10
S1.E7 ∙ Treasures of the Lost Mine Wed, Dec 04, 2019 Beneath the city of Istanbul lie hundreds of ancient subterranean cisterns. 0 /10
S1.E8 ∙ Ghosts of the Hell Maze Wed, Dec 11, 2019 A maze of tunnels in France has served as a wartime hideout for centuries. 0 /10
S1.E9 ∙ Conspiracy in the Buried City Wed, Dec 18, 2019 An ingenious trick conceals an underground city from invaders. 0 /10
S1.E10 ∙ Curse of Cannibal Caves Wed, Dec 25, 2019 A cave system is home to some of the oldest human remains ever discovered. 0 /10
