Man, some people just can't appretiate the unknown things in life. But great find! I know my school, the University of Wisonsin- Whitewater has underground tunnels leading all over the place. They lead from every residence hall, from every acedemic building and the University Centre, to a gas-fire powerplant, about 1/2 mile away. But don't stop urban exploring, it's so cool to see everything that goes into making a builing, complex, subway tunnel....etc.