After the occupation, the Germans began producing heavy water in Norway. After commando raids and bomber attacks, the Germans decided to move heavy water supplies to Germany. The Allies maintained a deception of a planned invasion of Norway. As a result, additional German forces were held there to repel any attempts. In 1944, Finnmark was liberated by the Soviet Union, and (together with the northern parts of Troms) totally destroyed by the retreating Nazis. German forces surrendered on 8 May 1945.