Underground Marvels — Season 1, Episode 6: World's Biggest Labyrinth
Documentary • 45 min • 2 seasons, 20 episodes • ★ 6.5/10
Episode synopsis
The world's biggest labyrinth is a 1,553-mile cave system that's home to some of history's darkest mysteries, and new discoveries at this strange place reveal the long-lost secrets of Nazi occupation, Soviet revolution, and Cold War subterfuge.
About Underground Marvels
Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.