I didn't think I'd end up watching the whole thing, but it was very interesting.
[yt]http://www.youtube.com/watch?v=vWF3IDk9Gek[/yt]
You can find out more about it at the guy's site; Undercity (http://undercity.org/). I'm suddenly interested in finding more videos of forgotten areas.
Very interesting. Might go look up some more videos like this.