Sci. Ch. - Underground Marvels Series 1 (2019) Part 1 Secrets of the Rock

Underground Marvels Series 1 Part 1 Secrets of the Rock

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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