Weddell seals (Leptonychotes weddellii) congregate in areas where natural cracks in the ice provide easy access into and out of the water, and while Antarctic waters remain around -2°C (~28°F) which may seem cold to us, these seals are well adapted to spending hours at a time in the water.
[Caption and Photo taken (under MMPA Permit 17411) by Skyla Walcott]
Stirling, I. (1969). Ecology of the Weddell seal in McMurdo Sound, Antarctica. Ecology, 50(4), 573-586.