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에피소드
- 시즌 1 에피소드 1 - Gibraltar2019년 7월 7일44분New 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.프라임 가입하기
- 시즌 1 에피소드 2 - Sweden2019년 7월 14일44분Exploring 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.프라임 가입하기
- 시즌 1 에피소드 3 - Switzerland2019년 7월 21일44분Examines 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.프라임 가입하기
- 시즌 1 에피소드 4 - Kingdom of Salt2019년 7월 28일44분The 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.프라임 가입하기
- 시즌 1 에피소드 5 - Bouzincourt2019년 8월 4일44분A 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.프라임 가입하기
- 시즌 1 에피소드 6 - City of Naours2019년 8월 11일44분Explores 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.프라임 가입하기
- 시즌 1 에피소드 7 - Jersey War Tunnels2019년 8월 18일44분An 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.프라임 가입하기
- 시즌 1 에피소드 8 - The Maginot Line2019년 8월 25일44분An 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.프라임 가입하기
- 시즌 1 에피소드 9 - Edinburgh Vaults2019년 9월 1일44분The 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.프라임 가입하기
- 시즌 1 에피소드 10 - Dover War Rooms2019년 9월 8일44분Exploring the military headquarters built beneath Dover Castle during the Second World War, and Odessa's catacombs, possibly the largest tunnel network in the world.프라임 가입하기
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