The events unfold during the Battle of Sevastopol at the end of 1942. The city is besieged by Nazi troops and some confrontations occurred inside it. The only hope for the defeders is the help from the sea. Two destroyers Derzkiy and Stremitelniy break into the city. Under the aviation bombardment they are trying to break through the mined area but Derzkiy sinks. Stremitelniy delivers supplies and repelnishments but the most difficult task is in advance. They need to battle through again with the wounded defenders of Sevostopol.