i think the name of the game here is get out of the wind and into a hole.the lost in the snow movies have someone wandering around until they fall and if their lucky Lassie shows up and saves them.. "good girl--arf--arf--"..i read where in the Russian Army they have a winter training exercise where the guys have to sleep in the snow "graves" in their greatcoats,no sleeping bags..those long wool jackets that were a Russian trademark.they would fly them from the warmer parts of the country to take part in this,every one had to do it as part of basic training.
the idea being that you don't have to be afraid of the sub zero cold,you can survive in it.now i have no more info on this,was it one guy to a hole or a hundred in a huge snow cave?.the point is that it's not as hard as it sounds if you keep you head..