> I simply cannot imagine expending anymore effort than simple survival, let alone actually swim somewhere. I've been in ice cold (including ice covered) water

> I simply cannot imagine expending anymore effort than simple survival, let alone actually swim somewhere. I've been in ice cold (including ice covered) water a few times, mostly voluntarily. So has a number of my friends, including some close friends/family who are more extreme and used to swim in the sea every week all through the Norwegian winter. Focus on breathing seems to be the best advice I picked up (and also of course have friends nearby). Also testing it in a shower with the coldest cold water you can get might give you an idea of what to expect, as well help you get used to the breathing.