Discovery Inc - Underground Marvels Series 2 (2021) Part 1 Hotel Bunker of the Apocalypse

Underground Marvels Series 2 Part 5 Irelands Underground Alcatraz

Subterranean military fortresses situated on the southern coast of Ireland have protected against enemy invasion for over 400 years, and now, experts investigate how this powerful stronghold transformed into a brutal and terrifying prison.

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