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Schulz kills with his own hand for the second time. Klaus Hoffmann has to realize that the Allied invasion is already underway. In Naples, a man with a murder mission is waiting.
After a risky maneuver, the U-330 appears next to a US Navy ship. SS man Koch uncovers the identity of the spy "Fidelio". Hannie gets on the trail of the Lebensborn organization.
Klaus Hoffmann commands the ailing U-330 on a secret dive, but not all the men trust him. Hannie wants to take Hertha in. Staff officer Heinrich Gluck has to make a decision.
Commander Buchner reaches the coast of Naples. Klaus Hoffmann is also on his way there. His sister Hannie meets twelve-year-old Hertha.
Robert Ehrenberg supports the resistance within the Navy and gives Klaus Hoffmann a clue. Bobby Schulz is on his trail. U-949 comes under fire in the Strait of Gibraltar.
August 1943: Franz Buchner is in action with the U-949. An informer on board divides his crew. The Hoffmann family gathers in Berlin to attend the premiere of a film about Klaus.
Three thrilling storylines intertwine in this season. Chief engineer Ehrenberg and his crew have to fulfill an impossible mission. Forster and Hoffmann find themselves working together in Lisbon. Hannie Lessing struggles and subsequently plays with fire.
Three storylines intertwine in this season. U-boat ace Von Reinhartz is chased across the Atlantic after his loyalty is questioned. Hoffmann finds shelter with Sam in New York. In La Rochelle, Margot battles to save a Jewish family as Forster closes in.
During 1942, in occupied France, U-612 is now ready for its maiden voyage, preparing to head into the increasingly brutal warfare with its young crewmen and the new captain, Klaus Hoffmann.