season 1
Uncover the extraordinary worlds lying just below modern urban centers.
44:03S1 E10 - Secret School and Concealed Castle CemeteryA mysterious tunnel, colonial ruins. and warrior cemeteries are exposed.TV-PG | 04.25.2026
44:03S1 E9 - Subterranean Seoul and Railway RevealedUnderground chambers, medieval tombs, old ruins and fossils are uncovered.TV-PG | 04.25.2026
44:03S1 E8 - Bones Beneath and Coffins and CoinsA sealed tomb containing 12 skeletons; unearth a hoard of coins hidden during a Scottish massacre.TV-PG | 04.25.2026
44:03S1 E7 - Buried Battleship and Viking VictimsA buried ship, wartime cellars, jar burials and mass graves are excavated.TV-PG | 04.25.2026
44:03S1 E6 - Subterranean Secrets and Forgotten FoundationsExplorers find a tunnel system, mass graves, city foundations, and longhouses.TV-PG | 04.25.2026
44:03S1 E5 - Labyrinths and LegendsVolunteers unearth tunnel systems, and a sealed burial tomb is found.TV-PG | 04.25.2026
44:03S1 E4 - Tunnels and TombsExplorers discover tunnel systems, a sprawling city, and military barracks.TV-PG | 04.25.2026
44:06S1 E3 - Hidden Hypogeum and Lost LettersArchaeologists find a tomb, a haunting cave, and a sophisticated labyrinth.TV-PG | 04.25.2026
44:06S1 E2 - Crystal Cathedrals and Buried BunkersScientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.TV-PG | 04.25.2026
44:03S1 E1 - Underground Cities and Secret ChambersScientists uncover a city, a chamber, and a complex, and map a tunnel network.TV-PG | 04.25.2026