Underground Marvels

Season 2 Episode 5: Ireland's 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.

Genre:

Documentary

Seasons:

2

Episodes:

20

Cast:

Chris Jarman

Quality:

HD

Duration:

45 min

First Air:

2019

Rating:

6.5