University of Toronto has a huge network of these, however after a series of tunnel exploration exploits they pretty much created a gated access system.
I remember exploring these tunnels. It was surprising how far you could go. Pretty much anywhere on campus.
Yes, Museum at the North all the way to college and StGeorge - further now with new construction. They also added refrigeration with a chilling building. I was amazed at the heat huge volumes of books quietly oxidising in stacks 80-100 feet deep give off - and there was another hiding area - student carrels CAN fit 2.... if they are good friends..
wow, I totally forgot about infiltration.org.
Thanks for that blast from the past man.
Yes, blasted through those tunnels in first year in 1958, steamy, warm dripping/hissing places. The Devonshire place(residence) cat often went there for warmth and mice etc.