St Marys Hospital Tunnel to Phoenix Park Mag Fort? Home › Forums › Ireland › St Marys Hospital Tunnel to Phoenix Park Mag Fort? This topic has 2 replies, 3 voices, and was last updated 15 years, 6 months ago by Anonymous. Viewing 2 reply threads Author Posts July 2, 2009 at 9:02 pm #710625 VforVendettaParticipant Can anybody tell me any information to where these tunnels lead? They start at St Marys Hospital but where they lead is a mystery. Rumored to lead to the Magazine fort whether its true or not god only knows! Any information would be great. v July 3, 2009 at 9:10 am #808123 AnonymousInactive St Marys used to be the Royal Hibernian Military School. Would that be a reason for them to lead to the Magazine Fort? July 3, 2009 at 7:59 pm #808124 AnonymousInactive yeah thats one possibility only the tunnels branch off into different directions so its a mystery Author Posts Viewing 2 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In Latest News