Cool tunnels, but you should check out the tunnels beneath the University of Alberta - I had access to one small portion under the old greenhouse that was cut off from the rest (until they locked it up, I think), and it was like a nightmare down there. Old radioactive rock samples from the geology department were down there, ice rooms that looked like a morgue, and two story rooms that disappeared into the dark. The main system connects only parts of the campus; available for use by everyone during the winter, then there are the service tunnels run everywhere. VERY easy to get completely lost down there, since the only always-on lights were at infrequent intersections. Also, will soon post some pics from my new campus, University of Manitoba, that are just as cool.