Underground Worlds

Series 2
1:00:00

Series 2, Episode 2 - Grand Canyon's Lost Treasure

4.0 7 x
New. Exploring inside the Grand Canyon Caverns - North America's largest dry cave system. Plus, Cold War radar bunkers around the UK.
1:00:00

Series 2, Episode 1 - Murder Raid Tunnels

3.0 4 x
Exploring the extensive air raid tunnels hidden beneath Ramsgate. Also, how the former thriving mining town of Butte, Montana repurposed the 10,000 miles of tunnels.
1:00:00

Series 2, Episode 1 - Murder Raid Tunnels

4.5 11 x
New. Exploring the extensive air raid tunnels hidden beneath Ramsgate. Also, how the former thriving mining town of Butte, Montana repurposed the 10,000 miles of tunnels.
Series 1
1:00:00

Series 1, Episode 7 - Jersey War Tunnels

4.5 8 x
The underground bases built by the German army during the occupation of Jersey, and a group of more than 20 underground cities in Turkey, one of which dates back to 800BC.
1:00:00

Series 1, Episode 7 - Jersey War Tunnels

3.0 4 x
The underground bases built by the German army during the occupation of Jersey, and a group of more than 20 underground cities in Turkey, one of which dates back to 800BC.
1:00:00

Series 1, Episode 6 - City of Naours

4.0 2 x
An underground city beneath a forest in Northern France built to house 3,000 people, an ice cave under Iceland's biggest glacier, and a subterranean power station in London.
1:00:00

Series 1, Episode 6 - City of Naours

3.0 4 x
An underground city beneath a forest in Northern France built to house 3,000 people, an ice cave under Iceland's biggest glacier, and a subterranean power station in London.
1:00:00

Series 1, Episode 5 - Bouzincourt

3.0 10 x
A labyrinth of tunnels underneath a tiny French village which contains mysteries from several historical eras, and a Welsh slate mine that has been given a new lease of life.
1:00:00

Series 1, Episode 5 - Bouzincourt

4.0 5 x
A labyrinth of tunnels underneath a tiny French village which contains mysteries from several historical eras, and a Welsh slate mine that has been given a new lease of life.
1:00:00

Series 1, Episode 4 - Kingdom of Salt

3.0 6 x
The Wieliczka Salt mine in Poland, some 327 metres deep, where the voids left behind from excavating salt have been transformed into extraordinary spaces, carved by hand.
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