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Underground Marvels

Underground Marvels

2019Returning Series2 Seasons20 Episodes6.5TMDB
ScienceU&Yesterday

Historians, engineers, ​and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.

Season 2 Episodes

Browse every episode and jump into details.

Episode 1: Hotel Bunker of the Apocalypse

Aug 5, 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.

Episode 2: Mystery of the Kentucky Cave

Aug 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.

Episode 3: Cincinnati's Secret Caverns

Aug 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.

Episode 4: Buried Lab of the Black Hills

Aug 26, 2021 · 45m

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.

Episode 5: Ireland's Underground Alcatraz

Sep 2, 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.

Episode 7: Italy's Subterranean Secret

Sep 16, 2021 · 45m

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.

Episode 8: Grand Canyon's Lost Treasure

Sep 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.

Episode 10: Medieval Maze of Secrets

Oct 7, 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.

Season 2 FAQ

Quick answers about this season's release timeline and episode lineup.

When did Underground Marvels Season 2 premiere?

Underground Marvels Season 2 premiered on August 5, 2021.

How many episodes are in Underground Marvels Season 2?

Underground Marvels Season 2 has 10 episodes.

What is the first episode of Underground Marvels Season 2?

The season opens with Season 2 Episode 1, "Hotel Bunker of the Apocalypse". It aired on August 5, 2021.

Go to Season 2 Episode 1

Where to Watch

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