Underground Marvels
(2019)Streaming Episode Guide
Season 2
Medieval Maze of Secrets
Episode 10 - 10-07-2021
45m
A forgotten world of ancient underground passages and medieval engineering lies hidden beneath the town of Exeter, England; experts investigate and reveal how this ambitious tunnel system was the result of one of the deadliest epidemics in history.
Haven't Seen
Murder Raid Tunnels
Episode 9 - 9-30-2021
45m
Experts explore an extensive network of tunnels beneath Ramsgate, England.
Haven't Seen
Grand Canyon's Lost Treasure
Episode 8 - 9-23-2021
45m
Descending more than 200 feet beneath the Arizona bedrock lies the largest dry cave system in North America; experts explore this vast subterranean network to reveal the mysteries and undiscovered treasure that remain hidden within its walls.
Haven't Seen
Italy's Subterranean Secret
Episode 7 - 9-16-2021
1h 0m
An unprecedented landslide unveils a hidden world beneath a picturesque town in northern Italy, and now experts investigate this vast network of tunnels and passageways that stretch 300 feet underground to reveal the city's subterranean past.
Haven't Seen
Subterranean Silo Survival
Episode 6 - 9-09-2021
1h 0m
Experts investigate a decommissioned underground missile launch facility.
Haven't Seen
Ireland's Underground Alcatraz
Episode 5 - 9-02-2021
45m
Subterranean military fortresses situated on the southern coast of Ireland have protected against enemy invasion for over 400 years, and now, experts investigate how this powerful stronghold transformed into a brutal and terrifying prison.
Haven't Seen
Buried Lab of the Black Hills
Episode 4 - 8-26-2021
1h 0m
Buried nearly a mile beneath the Black Hills of South Dakota is a cutting-edge laboratory at the forefront of astonishing scientific research; experts reveal advancements engineers achieved more than a century ago that keep it operating today.
Haven't Seen
Cincinnati's Secret Caverns
Episode 3 - 8-19-2021
45m
Deep beneath the streets of Cincinnati lies a network of deserted tunnels and caverns that contain a remarkable history of the city's origins, and now, experts investigate to reveal who built this underground labyrinth and why it was abandoned.
6.2/10Haven't Seen
Mystery of the Kentucky Cave
Episode 2 - 8-12-2021
45m
The longest known cave system in the world spans hundreds of miles beneath the hills of Kentucky, and containing prehistoric artifacts and ancient human remains, experts reveal a subterranean mystery that may have changed the course of U.S. history.
Haven't Seen
Hotel Bunker of the Apocalypse
Episode 1 - 8-05-2021
45m
The top-secret construction of a massive nuclear bunker remained concealed under a palatial West Virginia hotel for decades, and now, experts reveal how this vast subterranean structure was one of the most closely guarded Cold War secrets in US history.
Haven't Seen
Season 1
Curse of Cannibal Caves
Episode 10 - 12-26-2019
44m
A mysterious cave system is home to some of the oldest human remains ever discovered, and today, the explorers and researchers investigating this site are uncovering shocking evidence of cannibalism among its Ice Age denizens.
Haven't Seen
Conspiracy in the Buried City
Episode 9 - 12-19-2019
44m
A buried ancient city hidden five stories underground, and to keep its location secret from invaders, its residents devised an ingenious trick; experts reveal what it was, and using the latest tech, they reveal the truth behind this strange place.
6.8/10Haven't Seen
Ghosts of the Hell Maze
Episode 8 - 12-12-2019
44m
A labyrinth of tunnels in the French countryside has served as a secret hideout during wartime for centuries. On its walls, experts have discovered the final confessions of soldiers who fought here during one of the deadliest days of World War I.
Haven't Seen
Treasures of the Lost Mine
Episode 7 - 12-05-2019
Caverns hidden deep inside a remote mountain are home to a precious mineral found nowhere else on earth, and experts and treasure hunters use cutting-edge tech to follow rumors of a mysterious long-lost mine in search of a payday.
Haven't Seen
World's Biggest Labyrinth
Episode 6 - 11-21-2019
44m
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.
7.6/10Haven't Seen
Cave of the Body Snatchers
Episode 5 - 11-14-2019
44m
An eerie system of underground vaults in Scotland was once the hideout for thieves who stole newly-buried bodies and sold them; today, experts are excavating these rubble-filled caves to reveal the secrets of what these bandits left behind.
7.8/10Haven't Seen
The Renegade's Lair
Episode 4 - 11-07-2019
44m
A strange underground system known as the Black Cave was home to an infamous nobleman on the run from the law; today, experts investigate the secrets he left here to discover new parts of this mysterious network.
7.7/10Haven't Seen
Secrets of the Terror Tunnels
Episode 3 - 10-31-2019
44m
A vast system of tunnels built almost three thousand years ago was the site of the greatest battles of antiquity, and these disorienting passages could be the deadliest weapon in war; experts reveal what made this underground world so terrifying.
7.9/10Haven't Seen
Mystery of the Lost Labyrinth
Episode 2 - 10-24-2019
44m
A strange, centuries-old labyrinth built into an abandoned quarry was built by an eccentric millionaire, and no one knows why; but now, a new excavation into this mysterious 9,000-foot tunnel system might finally reveal its dark secrets.
7.5/10Haven't Seen
Secrets of the Rock
Episode 1 - 10-17-2019
45m
A hidden, subterranean city built within the Rock of Gibraltar was an immense fortress to control the seas during World War II, and new discoveries reveal the secrets of a long-lost chamber with evidence of high-stakes espionage.
7.7/10Haven't Seen
Top 5 Highest Rated Episodes 7.9/10
7.8/10 7.7/10 7.7/10 7.6/10
Secrets of the Terror Tunnels
Episode 3 - 10-31-2019
44m
A vast system of tunnels built almost three thousand years ago was the site of the greatest battles of antiquity, and these disorienting passages could be the deadliest weapon in war; experts reveal what made this underground world so terrifying.
7.9/10Haven't Seen
Cave of the Body Snatchers
Episode 5 - 11-14-2019
44m
An eerie system of underground vaults in Scotland was once the hideout for thieves who stole newly-buried bodies and sold them; today, experts are excavating these rubble-filled caves to reveal the secrets of what these bandits left behind.
7.8/10Haven't Seen
Secrets of the Rock
Episode 1 - 10-17-2019
45m
A hidden, subterranean city built within the Rock of Gibraltar was an immense fortress to control the seas during World War II, and new discoveries reveal the secrets of a long-lost chamber with evidence of high-stakes espionage.
7.7/10Haven't Seen
The Renegade's Lair
Episode 4 - 11-07-2019
44m
A strange underground system known as the Black Cave was home to an infamous nobleman on the run from the law; today, experts investigate the secrets he left here to discover new parts of this mysterious network.
7.7/10Haven't Seen
World's Biggest Labyrinth
Episode 6 - 11-21-2019
44m
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.
7.6/10Haven't Seen
