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Seasons
10. Dover War Rooms
September 8, 2019
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.
9. Edinburgh Vaults
September 1, 2019
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.
8. The Maginot Line
August 25, 2019
An exploration of 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.
7. Jersey War Tunnels
August 18, 2019
An exploration of 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 800 BCE.
6. City of Naours
August 11, 2019
Explores an underground city beneath a forest in Northern France built to house 3000 people, an ice cave under Iceland's biggest glacier, and a subterranean power station in London.
5. Bouzincourt
August 4, 2019
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.
4. Kingdom of Salt
July 28, 2019
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.
3. Switzerland
July 21, 2019
Examines some of Switzerland's 300,000 subterranean bunkers, the creation of an entrepreneur in England that's shrouded in mystery, and a network of man-made tunnels deep beneath Slovenia.
2. Sweden
July 14, 2019
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. Gibraltar
July 7, 2019
New discoveries reveal the secrets of a long-lost chamber with evidence of high-stakes espionage in a hidden subterranean city built within the Rock of Gibraltar.
Description
Where to Watch Underground Worlds
Underground Worlds is available for streaming on the Phoenix Television website, both individual episodes and full seasons. You can also watch Underground Worlds on demand at Amazon Prime and Amazon.
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Channel
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Premiere DateJuly 7, 2019
