In Winter, you jump into an icy pool and then find out....?

So the pool literally has ice bergs floating on it, an then you try to get out before you die but find that the surroundings have gone and you are in the middle of an endless ocean in which you can not EVER die. Woah, this is scary... How would you possibly cope, there must be a way of coping with this! How would you feel, what would you do?