Underground Worlds

Series 1
1:00:00

Series 1, Episode 10 - Dover War Rooms

3.0 3 x
Exploring the military headquarters built beneath Dover Castle during the Second World War, and Odessa's catacombs, possibly the largest tunnel network in the world.
1:00:00

Series 1, Episode 9 - Edinburgh Vaults

4.0 3 x
The sinister history of Edinburgh's vaults and the development of Helsinki's subterranean spaces. Plus, the impact of the building of Naples on the volcanic ground below.
1:00:00

Series 1, Episode 8 - The Maginot Line

3.0 2 x
The secrets of the largest subterranean fortress along France's border with Germany, and a look at how a unique precious mineral was discovered in Derbyshire.
1:00:00

Series 1, Episode 7 - Jersey War Tunnels

4.0 5 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

3.0 5 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 4 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

4.0 7 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.
1:00:00

Series 1, Episode 3 - Switzerland

3.0 5 x
A look at some of Switzerland's 300,000 subterranean bunkers, the creation of a local entrepreneur shrouded in mystery in England and a network of tunnels deep beneath Slovenia.
1:00:00

Series 1, Episode 2 - Sweden

4.0 6 x
Exploring Sweden's passion for subterranean spaces, and how the nation has taken extraordinary precautions to protect itself - by excavating an astounding 65,000 nuclear bunkers.
1:00:00

Series 1, Episode 1 - Gibraltar

4.0 5 x
Incredible feats of human endeavour, revealing what people have built, where they've built it, how and why. The first edition focuses on hidden tunnels and caves in Gibraltar.
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