Wow, quite an intense presentation for high school students. Check out this quote by one of the cops who worked the Rand case and gave the presentation (BBM, and MTHS = "Monroe Township High School"):
“[Living at Willowbrook]…it gave [Rand] such a knowledge of this place. I mean, I’ve been there, those buildings are a complex, maybe three times the size of [MTHS]. All of the buildings were connected by underground tunnels… It’s our opinion that he had the little girl [Schweiger] down there, but
there was no way the average cop even knew there were tunnels down there,” says Sergeant Scrivanni. “
We couldn’t find anyone that worked at the place, no one we could interview! We had to discover this stuff on our own.”
BBM: I'm a little surprised at this, since it was a state facility. Presumably all of the building plans would have had to be approved at a high level. Wouldn't there be an architectural map of the tunnels somewhere? And when they made the park, what happened to the tunnels? Were they excavated? Doubtful. Filled in? Were they ever fully searched? If LE never got a handle the tunnel system (and wouldn't these guys know that?), I'm guessing NOT. That blows my mind, frankly.
These tunnel systems were commonplace at big hospitals and other care institutions. I believe the thinking was that in an emergency, or bad weather, doctors could still get to their patients. My daughter went to an old medical school in Baltimore, and one of her first worries was that she wouldn't get snow days because they use the tunnels in bad weather! (Great priorities, honey

) Of course, these are some pretty nice tunnels. I went through one of them with her once. It connected the hospital to her first-year apartment building. It felt a bit like a subway to me.
These old places fascinate me, but at the moment I'm floored to think that Rand's primary stomping grounds may not have been completely searched for the remains of victims.