Looking for some info on the demo'd psych hospital in North Bay

Hello all. I've been on a hunt all morning trying to find blueprints or some kind of records on the demolished psychiatric hospital in North Bay. I figured a thread is more likely to get a response than commenting on the, like, 18 year-old album. I know that the hospital amounts to nothing but an overgrown field now, but I was wondering if anyone has/had access to blueprints of it that they would be willling to share? Or even just info on the tunnels. I am very interested in the underground portion of the hospital. No articles say whether they filled the tunnels, although I'm assuming they did. Regardless of the tunnels' fate, I would love any records or documentation of their existence. If anyone has it, that is. :)