Saw summert similar on t'telly a bit since. Some bloke was out on his fishing boat on his own one day when a bad storm came in. Whilst winching his net in somehow his sleeve got stuck in the winch and he got thrown overboard. He started to get dragged under and basically if he couldn't free the arm he would have drowned, so he whipped out the ol' Victorinox and hacked his arm off at the elbow. Apparently at the time he didn't give it a second thought, it was the natural thing to do, or he'd have bought it.