Underground Marvels
British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why.
- 2019-2021
- 2 seasons
- Science Channel
- Documentary
British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why.
Season 2 Episode Guide
10 Episodes 2021
Episode 1
Hotel Bunker of the Apocalypse
Thu, Aug 5, 2021 45 mins
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
Thu, Aug 12, 2021 45 mins
Exploring the vast 400-mile Mammoth Cave in Kentucky, USA. Plus, a newly constructed opening into a metal mine in Wales - untouched for over 70 years.
Episode 3
Cincinnati's Secret Caverns
Thu, Aug 19, 2021 45 mins
Mysterious caverns in the city of Cincinnati are examined. A network of cellars, wells and tunnels in Cincinnati that were used to create the world's most popular beer. Plus, a state-of-the-art Cold War fortress on the shores of Denmark.
Episode 4
Buried Lab of the Black Hills
Thu, Aug 26, 2021 60 mins
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
Thu, Sep 2, 2021 45 mins
Exploring hidden defences that have kept Cork Harbour, in Ireland, safe for over 400 years. How did this powerful stronghold became a brutal and terrifying prison. Plus, a former submarine base in the fjords of northern Norway.
Episode 6
Subterranean Silo Survival
Thu, Sep 9, 2021 60 mins
A decommissioned missile launch facility in Kansas remained one of the best kept subterranean military secrets of the Cold War, and now, experts reveal how this abandoned underground complex transformed into a state-of-the-art survival bunker.
Episode 7
Italy's Subterranean Secret
Thu, Sep 16, 2021 60 mins
Exploring caves beneath Orvieto in Italy, originally built by the Etruscans long before the Roman Empire.
Episode 8
Grand Canyon's Lost Treasure
Thu, Sep 23, 2021 45 mins
Exploring inside the Grand Canyon Caverns - North America's largest dry cave system. Plus, Cold War radar bunkers around the UK.
Episode 9
Murder Raid Tunnels
Thu, Sep 30, 2021 45 mins
Exploring the extensive air raid tunnels hidden beneath Ramsgate.
Episode 10
Medieval Maze of Secrets
Thu, Oct 7, 2021 45 mins
Exploring the maze of of long narrow tunnels beneath Exeter that were built in medieval times to protect the city. Plus, a marble quarry under the pine forests of Vermont.