Computer flooring/flooding/water in computer rooms

I was at a customers some years back.. Old building, but it had been totally gutted and all new insides. There was a small cupboard to the side of the computer room (actually more of an office, where the MVME based Motorola unix box and one of the patch panels lived) inside of which was the main fusebox for the floor. 415V three phase splitting off to (our normal) separate 240V circuits.. Anyway, I was sat at a desk with my back to the cupboard, server in front and to my left, and suddenly heard running water... turned around, and the wall behind me was swimming... opened the cupboard and it was pouring down the cables and across the fusebox.. The power went off shortly afterwards.. luckily it missed the server, which was on a UPS, and we did an orderly shutdown. It was Air Conditioning again .... For some reason known only to themselves, the AirCon plant for the floor was situated in the loft (Attic) directly above the computer room. It had a drip tray under it, which wasn't secured, nor drained properly. When it got full, it tilted, and dispensed it's entire load of water onto the floor, and hence us below! It did it again a few weeks later, too.... Not as much fun as the time we got a phonecall from a customer saying "My computer just blew up". We chuckled and said we'd come have a look, expecting a fuse blown or something. Arrived and found a PC clone with all the blanking plates, buttons, and the front of the floppy drive on the floor in front of it, the blanking plates on the expansion slots all bowed outwards, and a nasty smell in the air. We decided the remove the machine from site before opening it ... When we did, found it was a 486 machine where the battery backed CMOS ram was (had been) baked up by an external battery plugged into the board. This had been stuck to the back panel of the box. It had exploded! Possibly connected to the board backwards? The force of the explosion had been enough to fling bits of battery and the plastic box it was encased in /through/ the ribbon cables in the machine, as well as the aforementioned ejection of all loose fittings on the case. Battery acid everywhere, too, eating through tracks on everything. The hard disc survived long enough to get the data off it, but the rest of the machine was pretty much destroyed. And this poor girl had had it under her desk by her feet when it had gone bang! Poor thing must have had the shock of her life! Rob.