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Series Premiere

Underground Marvels: Season 1

1x01 Secrets of the Rock
TV-PG

  • 2019-10-17T21:00:00Z on Yesterday
  • 45m
  • United Kingdom
  • English
  • Documentary
A hidden, subterranean city built within the Rock of Gibraltar was an immense fortress to control the seas during World War II, and new discoveries reveal the secrets of a long-lost chamber with evidence of high-stakes espionage.
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