Seriously, I've worked on many seucrity systems throughout Austin. There's tunnels everywheres because that's how the undergrounds of cities work. This is no secret at all. Go under any major building in downtown Austin and you'll find the same stuff. Now there are tunnels leading from the governors mansion to the capitol building. Also tunnels going from the surrounding government buildings to the capitol. Most of those have card access, but you can just tailgate to get through. Also, there is a tunnel that runs from east to west under Colorado St. just north of West 6th between the UT buildings on either side. Check the map here: http://maps.google.com/maps?q=austin+tx&hl=en&ll=30.268433,-97.744187&spn=0.000005,0.003473&sll=37.0625,-95.677068&sspn=48.374125,113.818359&vpsrc=6&t=m&z=19&layer=c&cbll=30.268645,-97.744041&panoid=WYo_6tIZxy5j3FSx8neEEg&cbp=12,30.43,,0,0 It's right under where the picture is looking. There's many others but you'll have to find them on your own. Oh, lets not forget the 7 level underground facility in the Austin area, only myself and a handful of other people know about, but that secret will remain.