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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.
It's now December 1942, and U-boat ace Johannes von Reinhartz is handed a new secret mission to transport three saboteurs to the US East Coast on board U-822. When his loyalty is questioned, U-612 -- with its CO Wrangel -- is sent in pursuit.
Having escaped certain death out on the Atlantic, former U-612 CO Hoffmann finds shelter in New York with Sam Greenwood, who owes his life to Hoffmann. He meets sleazy German-born lawyer Berger, but will Berger help Hoffmann to return home and clear his name?
Back in La Rochelle, Simone and her roommate Margot battle to secure an escape route for a Jewish family, but Forster, Head of the Gestapo, is watching their every move.
Season 1 begins in the Autumn of 1942 with two storylines running parallel on land and at sea: the submarine warfare is becoming increasingly brutal and the Resistance begins to gain influence in La Rochelle.
U-612 with their new commander Klaus Hoffmann is ready for its maiden voyage and the crew has to cope with the cramped and claustrophobic conditions under water, as they are physically and mentally pushed to their limits. Meanwhile, at the port of La Rochelle, the world of Simone Strasser spirals out of control as she is engulfed in a dangerous liaison and forbidden love, torn between her loyalty for Germany and the Resistance.