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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 Prime Video and Amazon.