Around this time of year around the 90's or so, I recall going for a walk across a local river that had frozen over. It seemed hard-frozen, so I chanced it and walked over to the other side. On returning over the river the bottom caved in the ice and very suddenly things turned differently instantly hitting freezing water. The only saving grace, was somehow I had managed to grab onto the ice at the top of the hole, otherwise I'd have been sucked under the ice and downstream, obviously. It was not a good experience. When getting out of the hole, I recall suffering from hypothermia and it just wasn't good at all.