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An abandoned concrete wall... five strange deserted structures. A lost escape route from nuclear Armageddon... A submerged link to D-day... Once they were at the cutting edge of design and construction, now they lie disused, contaminated and dangerous. But who built them? And why were they abandoned?

Release Date: 2017-02-18
Seasons: 1 2 3 4 5 6 7 8 9 10 11 12 13
TMDb: 7.3/10
  • Country: GB
  • Language: English
  • Runtime: 44

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