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Spring 1943: L.I. Ehrenberg prepares submarines for use in Kiel. Minors are recruited as crews. Wilhelm Hoffmann attends a reception at the request of his son-in-law.
As Forster investigates the Dorfmann murder in Lisbon, the U-949's new sailors get into a fight in Kiel and Swinburne attends his son's funeral.
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.