Aboard submarine U-612, the atmosphere heats up with the implicit rivalry between 'parachuted son' captain Hoffmann and solid veteran XO Tennstedt, all mistrusting VIP passenger Samuel Greenwood, for whom they lost another man, and who now flaunts being an American opportunistic businessman investing in arms. Frank falls out of favor, nicknamed the Frenchie. Gestapo officer Hagen Forster invites Simone out privately. The resistance, led by a communist hothead, rewards Simone with a passport for Frank's secret Jewish bride who hides as brothel waitress, but also plan a bomb attack. The crew gets another shot at a convoy.
—KGF Vissers