The much anticipated second series of Das Boot. December 1942. We meet the very experienced U-boat ace Johannes von Reinhartz (Clemens Schick) who is sent with U-822 on a secret mission to the US East Coast in order to disembark three saboteurs. His loyalty is questioned and U-612, with its Commanding Officer Wrangel (Stefan Konarske), is sent in pursuit. Former U-612 Commanding Officer Hoffmann (Rick Okon) narrowly escaped death in the Atlantic Ocean. In New York he finds shelter with Sam Greenwood (Vincent Kartheiser), who owes his life to Hoffmann, and meets the sleazy German-born lawyer Berger (Thomas Kretschmann). Will he enable him to return to Germany? Back in La Rochelle, Simone (Vicky Krieps) is still secretly helping those affected by the Nazi occupation, and Forster (Tom Wlaschiha), Head of the Gestapo, suspects as much, as Simone and her roommate Margot (Fleur Geffrier) work to secure an escape route for a Jewish family.