Underground Worlds

For centuries, people have built mind-blowing structures underground. This new and exclusive series reveals incredible feats of human endeavour and reveals what people have built, how they built it and why.

Watch on UKTV Play

Underground Worlds
Underground Worlds

Series 1 | Episode 4

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.

Underground Worlds
Underground Worlds

Series 1 | Episode 3

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.

Underground Worlds
Underground Worlds

Series 1 | Episode 2

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.

Underground Worlds
Underground Worlds

Series 1 | Episode 1

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.

Underground Worlds
Underground Worlds

Series 1 | Episode 8

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.

Underground Worlds
Underground Worlds

Series 1 | Episode 7

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.

Highlights from the Show

4 Hidden Places You Never Knew Existed
4 Hidden Places You Never Knew Existed

Here are just four of the strangest subterranean spots you never knew were there.