Yep! I spent two years of my Army life stationed at Churchill, Manitoba, on the shores of Hudson's Bay.
We had the best arctic clothing in the world at the time, starting with a heavy mesh undershirt and multiple layers, felt lined mukluks, wind pants and a pretty skookum parka with a tunnel hood.
Still, we were told that if we were unable to move due to injury or enemy action, we had 45 minutes of life remaining.
One of my fellow linemen had a tripod of telephone poles collapse under his weight and crashed on top of a pole, fracturing his femur.
I took off my parka and put it under him then trudged back to the truck to flag down a vehicle with a radio, another lineman staying with him. We alternated every 15 on the clock.
It took almost an hour to get help by radio and the injured man was now incoherent, convulsing with the cold and shock, in the advance stages of hypothermia.