So what about if you're an alumni student but still have your ID card, think it'd be safe to go adventuring in such tunnels? I've heard my old college even has a fallout shelter somewhere, i'm interested in going and looking for it. I just don't want to get caught.
Also, where around the L.A. area would be good to explore? The metro rail tunnels might be interesting during nonoperation hours but not sure how safe that would be. Sadly I got banned from exploring the building I work in, 'cause one of my idiot coworkers got caught sitting on the edge of the roof [12 stories up.]