Firstly and I speak as an amature sailer (yachts) rule number one- you always stay with the boat! that is unless it has actually completely sunk the reason is simple- it is a lot easier for the rescuers to spot a boat even partially submerged than your little head bobbing about. So stick with Bitcoin it may be having a bit of a rough time but I strongly recommend staying with it, at least until it slips gently under, (which isn't going to happen.