I have been a browser of UE for almost a year now. I've been exploring since I was a kid growing up in Philadelphia. Most of my teenage years and early 20's were spent trudging through the tunnels of Byberry and running away from security. I will be gaining access to Danville again this summer, a family member has been having various "experiences" there at night and most of their co-workers have had similar things happen to them. I've always had this nagging to get in there and I know it will be next to impossible to sneak my good camera in. I will be posting what I can if they turn out well. They tell me of the underground tunnels that are sealed off inside the basements but they haven't found the entrances inside the buildings, yet. My goal on the next trip will be to find them. I can't imagine it's set up much different than any other state facility. If anyone has any recent info that would be great!