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Underground Worlds

  • Season 1
  • 10 episodes
  • Documentary

Summary

Incredible feats of human endeavour, revealing what people have built, where they've built it, how and why.

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Episode 3: Switzerland

Summary

A look at some of Switzerland's 300,000 subterranean bunkers, built across history. Plus, the extraordinary creation of a Liverpool entrepreneur that's shrouded in mystery, and a network of man-made tunnels used by adventurous subterranean thrill-seekers deep beneath Slovenia's landscape.

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