Claus Helberg is caught by the Germans. He manages to escape, but is badly wounded. Still, he succeeds in getting back to England. Werner Heisenberg is assigned to continue his work without heavy water, but explains that no heavy water means no bomb. Erik Henriksen refuses to give priority to the rebuilding and increase the delivery of heavy water and is immediately arrested. Learning that the Germans are rebuilding the factory, the Americans decide to bomb it against Tronstad’s advice. 150 B-25 bombers are sent on the mission, but the only result is heavy civilian casualties. The reconstructed heavy water facilities are undamaged. The Germans now want to move the entire production to Germany, and the Allies decide to strike at the weakest link on the route: the unavoidable ferry across the deep lake next to the factory.