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Saison 1
Date de diffusion
Sept 25, 2019
Gibraltar is just 6.8 square kilometres in area, but the size of its role in WWII is immeasurable. Beneath its distinctive landscape lie no less than 55 kilometres of hidden tunnels and
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Gibraltar is just 6.8 square kilometres in area, but the size of its role in WWII is immeasurable. Beneath its distinctive landscape lie no less than 55 kilometres of hidden tunnels and caves, a subterranean city carved out by a military workforce.
Also, under London, 21st century engineering innovation continues the legacy of Victorian pioneers paving the way for the ultimate super sewer and Europe's largest and most breath-taking natural cave systems - The Postojna Cave in Slovenia.
Date de diffusion
Oct 02, 2019
A look at 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. Also,
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A look at 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. Also, the secret caverns and rock formations in Cheddar Gorge in Somerset, UK and an underground first in Romania.
Date de diffusion
Oct 09, 2019
A look at some of Switzerland 300,000 subterranean bunkers built across history. The extraordinary creation of a local entrepreneur that's shrouded in mystery in Liverpool, England. And,
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A look at some of Switzerland 300,000 subterranean bunkers built across history. The extraordinary creation of a local entrepreneur that's shrouded in mystery in Liverpool, England. And, a network of tunnels created by man and today used by adventurous subterranean thrill-seekers deep beneath Slovenia's beautiful landscape.
Date de diffusion
Oct 16, 2019
The Wieliczka Salt mine in southern Poland, some 327 metres deep, where the voids left behind from excavating salt have been transformed into extraordinary spaces, carved by hand.
The Wieliczka Salt mine in southern Poland, some 327 metres deep, where the voids left behind from excavating salt have been transformed into extraordinary spaces, carved by hand.
Date de diffusion
Oct 23, 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.
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.
Date de diffusion
Oct 30, 2019
An underground city beneath a forest in Northern France built to house 3,000 people, a ice cave under Iceland's biggest glacier and a subterranean power station in London.
An underground city beneath a forest in Northern France built to house 3,000 people, a ice cave under Iceland's biggest glacier and a subterranean power station in London.
Date de diffusion
Nov 06, 2019
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 BC.
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 BC.
Date de diffusion
Nov 13, 2019
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.
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.
Date de diffusion
Nov 20, 2019
A look at 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.
A look at 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.
Date de diffusion
Nov 27, 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.
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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