The real "controversy" is...there is nothing "controversial" about it! People read way too much into some things.
Don't go "draining" (exploring storm drains) because you can get injured or killed in them, OK?
Don't go trespassing to explore old nuthouses and factories because, you can get injured or killed or arrested for doing so, OK?
What originally interested me, when I was much younger and a lot more stupid, was the line of thought of using storm drains as a shelter. An idea I got out of a book.
So, my post below about the Undercity Website stirred up a couple of comments which I have deleted.
I'm not encouraging you to become involved in Urban Exploration anymore than I am encouraging you to be homeless and live in your vehicle or encouraging you to break your arm so you can see what type of emergency firestarter will really work for you. What I am encouraging you to do is read about it and learn from it. Nothing more, nothing less. Some people think that simply by squashing information that certain things are just going to go away. The world doesn't work that way.