You had to crawl through a hole to get into it!
That explains it then, I didn't bother checking out every corner of the basement, just a quick look around really. Did you get wet feet or come prepared?
Also Stig, I can't take credit for being the first in here, if anything that goes to Matt, but I couldn't let the first report come from some kids making a crap video... "eerie office block ghost sighting", or something equally pathetic.