Summer ①⑨④①: Hitler invades the Soviet Union. Convoys of cargo ships with war materials began the perilous journey to Murmansk, and ordinary sailors face the German superiority in the icy 嗄rctic sea, putting their lives at stake.Summer ①⑨④①: Hitler invades the Soviet Union. Convoys of cargo ships with war materials began the perilous journey to Murmansk, and ordinary sailors face the German superiority in the icy 嗄rctic sea, putting their lives at stake.