The tunnel system at Univeristy of Illinois Chicago looks almost identical to the UT tunnel system. However, the tunnels at UIC are no legend, they are not exactly public but no one denies they are there (does that make sense?). Myself and two friends worked for campus security and they told us the tunnels existed, and we should never go down there since our radios wouldnt work down there if we got hurt (its easy to fall down there). So of course we went down there about half a dozen times. The entrances are not marked, but are completely obvious. Also, there are no locked doors so access is as easy as being able to open the door. One time we gained access to University Hall and got into the chancellor's office on the 28th floor. What we did there remains legendary (no, we did not vandalize anything or engage in homoerotic behavior) to every incoming freshman. What a great time we had, but we got bored with it after a few months.