Browse episode ratings trends for Underground Marvels. Simply click on the interactive rating graph to explore the best and worst of Underground Marvels's 20 episodes.
Best Episodes of Underground Marvels
Secrets of the Terror Tunnels
S1 Ep3
8.2
31st Oct 2019
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.
Mystery of the Lost Labyrinth
S1 Ep2
7.9
24th Oct 2019
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.
Cave of the Body Snatchers
S1 Ep5
7.8
14th Nov 2019
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.
Grand Canyon's Lost Treasure
S2 Ep8
7.7
23rd Sep 2021
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.
Hotel Bunker of the Apocalypse
S2 Ep1
7.6
5th Aug 2021
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.
World's Biggest Labyrinth
S1 Ep6
7.6
21st Nov 2019
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.
Worst Episodes of Underground Marvels
Ghosts of the Hell Maze
S1 Ep8
7.0
12th Dec 2019
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.
Curse of Cannibal Caves
S1 Ep10
7.1
26th Dec 2019
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.
The Renegade's Lair
S1 Ep4
7.2
7th Nov 2019
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.
Buried Lab of the Black Hills
S2 Ep4
7.2
26th Aug 2021
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.
Murder Raid Tunnels
S2 Ep9
7.2
30th Sep 2021
Experts explore an extensive network of tunnels beneath Ramsgate, England.
Mystery of the Kentucky Cave
S2 Ep2
7.4
12th Aug 2021
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.
Underground Marvels Episode Guide
Secrets of the Rock
S1 Ep1
7.6
17th Oct 2019
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.
Mystery of the Lost Labyrinth
S1 Ep2
7.9
24th Oct 2019
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.
Secrets of the Terror Tunnels
S1 Ep3
8.2
31st Oct 2019
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.
The Renegade's Lair
S1 Ep4
7.2
7th Nov 2019
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.
Cave of the Body Snatchers
S1 Ep5
7.8
14th Nov 2019
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.
World's Biggest Labyrinth
S1 Ep6
7.6
21st Nov 2019
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.
Treasures of the Lost Mine
S1 Ep7
7.6
5th Dec 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.
Ghosts of the Hell Maze
S1 Ep8
7.0
12th Dec 2019
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.
Conspiracy in the Buried City
S1 Ep9
7.5
19th Dec 2019
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.
Curse of Cannibal Caves
S1 Ep10
7.1
26th Dec 2019
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.
Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.
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The best rated episodes of Underground Marvels are:
Secrets of the Terror Tunnels S1E3 rated 8.2
Mystery of the Lost Labyrinth S1E2 rated 7.9
Cave of the Body Snatchers S1E5 rated 7.8
Grand Canyon's Lost Treasure S2E8 rated 7.7
Hotel Bunker of the Apocalypse S2E1 rated 7.6
World's Biggest Labyrinth S1E6 rated 7.6
The lowest rated episodes of Underground Marvels are:
Ghosts of the Hell Maze S1E8 rated 7.0
Curse of Cannibal Caves S1E10 rated 7.1
The Renegade's Lair S1E4 rated 7.2
Buried Lab of the Black Hills S2E4 rated 7.2
Murder Raid Tunnels S2E9 rated 7.2
Mystery of the Kentucky Cave S2E2 rated 7.4
The first episode of Underground Marvels aired on October 17, 2019.
The last episode of Underground Marvels aired on October 07, 2021.
There are 20 episodes of Underground Marvels.
There are 2 seasons of Underground Marvels.
Yes.
Underground Marvels is set to return for future episodes.
