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 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.

Underground Worlds
Underground Worlds

Series 1 | Episode 6

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.

Underground Worlds
Underground Worlds

Series 1 | Episode 5

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.

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.

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.