Ush, don't know if you know anything about this, but, well, wow.
http://usvsth3m.com/post/74285062011/yo ... -currently
The story is, some guys were filling in an old lift shaft with concrete.. fast-setting concrete.
Well, nobody checked if there was an important control room connected to it. Encasing your control gear in concrete, that's one way to ruin your day. Or, you know, more than a day.