that wheel is stunning! best I've seen!!! (pics of) I guess its so complete thanks to it barely being worked?
as for false floors :s worst Ive come across was a stope, with a lagoon suspended over a false floor, held up with a 3/4tonne boulder packed around with mud. Our presense on the floor made the mudshift, and the water started to leak, undermining the 3/4 tonne boulder that would just take everything out and leave us with no exit. we had to extremely quickly get both sides of the boulder and rebuild the mud bank before it got worse, as chances are we wouldn't have been able to crawl fast enough to outrun it. am still here, but now extremely warey of them :/