Science 2019 - 2021 2 seasons 20 eps TV-PG Returning series

Underground Marvels

2019 - 2021 2 seasons 20 eps TV-PG

6.8

Season 2

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Season 1

Season 2

All episodes

42 min

S2 · E1 · Aug 5, 2021

Hotel Bunker of the Apocalypse Episode 1

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.

42 min

S2 · E2 · Aug 12, 2021

Mystery of the Kentucky Cave Episode 2

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.

45 min

S2 · E3 · Aug 19, 2021

Cincinnati's Secret Caverns Episode 3

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.

42 min

S2 · E4 · Aug 26, 2021

Buried Lab of the Black Hills Episode 4

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.

42 min

S2 · E5 · Sep 2, 2021

Ireland's Underground Alcatraz Episode 5

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.

42 min

S2 · E6 · Sep 9, 2021

Subterranean Silo Survival Episode 6

Experts investigate a decommissioned underground missile launch facility.

42 min

S2 · E7 · Sep 16, 2021

Italy's Subterranean Secret Episode 7

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.

42 min

S2 · E8 · Sep 23, 2021

Grand Canyon's Lost Treasure Episode 8

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.

41 min

S2 · E9 · Sep 30, 2021

Murder Raid Tunnels Episode 9

Experts explore an extensive network of tunnels beneath Ramsgate, England.

42 min

S2 · E10 · Oct 7, 2021

Medieval Maze of Secrets Episode 10

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.

10 episodes in Season 2

Some details come from TheTVDB.

Underground Marvels