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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.

English
  • Episode Number 6
  • DVD Season & Episode Number
  • Absolute Episode Number
  • Originally Aired Wednesday, October 30, 2019
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  • Last Updated By velouria264kmk
  • Last Updated 10/28/2019 3:59am