Underground Marvels Season 1 Episode 1 Secrets of the Rock 2019
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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.
- Released: 2019-10-17
- Runtime: 45 minutes
- Genre: Documentary
- Stars:
- Director:
