When did Underground Marvels Season 2 Episode 5 air?
Underground Marvels Season 2 Episode 5 aired on September 2, 2021.
Underground Marvels
Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.
Season 2 · Episode 5
Ireland's Underground Alcatraz
Sep 2, 2021·45m
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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How long is Underground Marvels Season 2 Episode 5?
This episode runs for approximately 45 minutes.
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