Senior lieutenant P. V. Leiberg of the Soviet Navy looks through binoculars on the bridge of the K-1 submarine, which was subjected to icing under low temperatures, in a combat campaign in December 1942.
Icing – the formation of ice on the hull and mechanisms of the ship. It occurs most intensively at an ambient temperature of -4 to -7 ° C, a seawater temperature of about 0 ° C, and a wind speed of over 11 m/s (39 km/h).