Upphovsland: Storbritannien
1. Gibraltar
Avsnitt 1 - Gibraltar, Säsong 1
Explores the 55 kilometres of tunnels that remain undiscovered beneath Gibraltar, and what they were originally built for.
2. Sweden
Avsnitt 2 - Sweden, Säsong 1
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.
3. Switzerland
Avsnitt 3 - Switzerland, Säsong 1
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 man-made tunnels deep beneath Slovenia.
4. Kingdom of Salt
Avsnitt 4 - Kingdom of Salt, Säsong 1
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.
5. Bouzincourt
Avsnitt 5 - Bouzincourt, Säsong 1
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.
6. City of Naours
Avsnitt 6 - City of Naours, Säsong 1
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.
7. Jersey, Czech Republic
Avsnitt 7 - Jersey, Czech Republic, Säsong 1
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.
8. The Maginot Line
Avsnitt 8 - The Maginot Line, Säsong 1
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.
9. Edinburgh Vaults
Avsnitt 9 - Edinburgh Vaults, Säsong 1
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.
10. Dover War Rooms
Avsnitt 10 - Dover War Rooms, Säsong 1
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.
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