Underground Marvels

Season 1 Episode 6: World's Biggest Labyrinth

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.

Genre:

Documentary

Seasons:

2

Episodes:

20

Actor:

Chris Jarman

Quality:

HD

Status:

Returning Series

First Air:

2019

IMDb:

6.5