LOL! I was just talking with my co-workers about the tunnels today and thought I'd go on line to see if I could find some pics. A few years back I was an administrator at UT (fairly high up, as a matter of fact) but like all academics in my younger days I was a sneaky little shit at well. When I first started working over there someone told me about the tunnels and I couldn't resist getting a look. But I had no "official" reason for going down there. Then one day I realized I could get a master facilities key - through my job - that would let me into about eighty percent of the locked doors under the campus. I was hooked!
I spent hours under the campus wandering around at night. And although I worked there, I still had no official business in the tunnels so if I were caught I would have been tossed out on my ear. So, needless to say, it was pretty thrilling to wander around down under there.
You guys didn't seem to get into the really old tunnels. There's actually some that appear to have been built in the early 20th century that are quite creepy. I'm not sure what they were used for prior to HVAC.
I have worked at UT in some years and I still miss crawling around under the campus.