Try knocking ice off the ship when it's north of the arctic circle. BTDT

Remember, it's cold enough to freeze salt water.

I have experience "Army Cold" in Wildflicken, Germany in December of 1967 during winter training I think the high temps that week were arond12F and the lows were around-5F. The winter combat gear worked very well, thanks be to God
I have been colder in SO CA high desert (around 4100 Ft above sea level) in February of 1978 while working up on a telephone pole about 20 Ft. above the ground at 10:30 PM at night with the wind blowing 25 to 35 MPH at 45F temps and right at 98 % humidity
Living here in Bend since 2005 we have seen the night temps get as low as -25 F
It is amazing what the human body can adapt and survive in