| Jürgen Prochnow | Der Alte / Capt.-Lt. Henrich Lehmann-Willenbrock |
| Herbert Gronemeyer | Lt. Werner / Correspondent |
| Klaus Wennemann | Der Leitende/Der LI/Chief Engineer/Fritz Grade |
| Hubertus Bengsch | 1st Lieutenant/Number One/1WO |
| Martin Semmelrogge | 2nd Lieutenant/2WO |
| Bernd Tauber | Kriechbaum/Chief Quartermaster/Navigator |
| Erwin Leder | Johann |
| Martin May | Ullman |
| Heinz Honig | Hinrich |
| Uwe Ochsenknecht | Chief Bosun |
A German submarine patrols the Atlantic Ocean during World War II, manned by a crew that must contend with tense conflicts and long stretches of confined boredom. While war correspondent Werner observes day-to-day life aboard the U-boat, the grizzled captain struggles to maintain his own motivation as he attempts to keep the ship's morale up in the face of fierce battles, intense storms and dwindling supplies.
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