Experts explore mysteries of abandoned subterranean phenomena around the world, sharing their impressive stories, unique origins and the secrets they still keep hidden underground.
Where to Watch Underground Marvels • Season 1
10 Episodes
Secrets of the Rock
E1
Secrets of the RockA city within the Rock of Gibraltar helped control the seas during WWII.
Mystery of the Lost Labyrinth
E2
Mystery of the Lost LabyrinthA new excavation hopes to reveal the secrets of the Williamson Tunnels.
Secrets of the Terror Tunnels
E3
Secrets of the Terror TunnelsTunnels built almost 3,000 years ago were used to trap enemies in battle.
The Renegade's Lair
E4
The Renegade's LairAn infamous nobleman on the run leaves his secrets in a Slovenian cave.
Cave of the Body Snatchers
E5
Cave of the Body SnatchersBeneath Naples, the ancient Greeks excavated tunnels deep underground. Add to My List
World's Biggest Labyrinth
E6
World's Biggest LabyrinthBeneath Dover Castle lies an underground world created to thwart Hitler.
Treasures of the Lost Mine
E7
Treasures of the Lost MineBeneath the city of Istanbul lie hundreds of ancient subterranean cisterns.
Ghosts of the Hell Maze
E8
Ghosts of the Hell MazeA maze of tunnels in France has served as a wartime hideout for centuries.
Conspiracy in the Buried City
E9
Conspiracy in the Buried CityAn ingenious trick conceals an underground city from invaders.
Curse of Cannibal Caves
E10
Curse of Cannibal CavesA cave system is home to some of the oldest human remains ever discovered.
Take Plex everywhere
Watch free anytime, anywhere, on almost any device.
