The Navy has a mandate to operate their subs anywhere on earth. Global lowest temperatures on record are around -90C, with the lows (in [0]) outside of Antarct

The Navy has a mandate to operate their subs anywhere on earth. Global lowest temperatures on record are around -90C, with the lows (in [0]) outside of Antarctica still hitting -68C. Being in the ocean will mediate some of those lows, but there's still the potential for exposure to very low temperatures on the surface. [0] https://en.wikipedia.org/wiki/Lowest_temperature_recorded_on_Earth https://en.wikipedia.org/wiki/Lowest_temperature_recorded_on...