Klaus Hoffmann pursues the German agent Weiss and discovers valuable information. U-949 is under heavy fire from Swinburne's destroyer - until Commander Buchner dares a maneuver.
The U-949 reaches Portugal and unloads the gold. When Ehrenberg returns to Kiel, he finds Greta with her husband again. Klaus Hoffmann and Forster reach their goal through blackmail.
Swinburne's destroyer sinks two submarines on the Atlantic, then he hunts U-949. Forster observes a secret meeting between consul Gruber and the American Gardiner.
After a risky manoeuvre, the U-330 shows up next to a US Navy ship; SS man Koch uncovers the identity of the spy Fidelio; Hannie gets on the trail of the Lebensborn organisation.
Wrangel and von Reinhartz have a dramatic battle on the Atlantic. Margot is horrified by a betrayal. The seriously injured Hoffmann asks Cassandra to leave the city with him.
Wrangel finally has U-822 in sight and now demands everything from his men. Von Reinhartz completely loses the backing of his team. Margot desperately tries to save Elias.
Robert Ehrenberg supports the resistance movement 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.