Ireland's Underground Alcatraz
- Episode aired Sep 2, 2021
- 45m
![Underground Marvels (2019)](https://m.media-amazon.com/images/M/MV5BMTg2MGYwMDktMmNmOC00Zjk3LWFjMGUtZWNmMWQ3Njk4OTRlXkEyXkFqcGdeQXVyNDQ0NjMyOA@@._V1_QL75_UY281_CR155,0,190,281_.jpg)
Exploring hidden defences that have kept Cork Harbour, in Ireland, safe for over 400 years. How did this powerful stronghold became a brutal and terrifying prison. Plus, a former submarine b... Read allExploring hidden defences that have kept Cork Harbour, in Ireland, safe for over 400 years. How did this powerful stronghold became a brutal and terrifying prison. Plus, a former submarine base in the fjords of northern Norway.Exploring hidden defences that have kept Cork Harbour, in Ireland, safe for over 400 years. How did this powerful stronghold became a brutal and terrifying prison. Plus, a former submarine base in the fjords of northern Norway.