The Allies order Knut Haukelid and two more remainders from ‘Gunnerside’ to sink the ferry with the heavy water facilities mid-way across the lake from Rjukan. Werner Heisenberg, knowing that the heavy water is on its way, claims to need only 500 additional litres to succeed with the atom bomb. He gets drunk with his superior Kurt Diebner who shows him secret documents about radiation effects leaving him scared and full of despair. Explosives are placed below deck Saturday night and Sunday morning the explosion goes off as passengers, crew and German soldiers desperately try to save themselves in the ice-cold water. The ferry goes down with every drum of heavy water. Despite the loss of 20 lives, the operation is defined a success by the Allies. They now consider “the heavy water issue” closed.