Kapitänleutnant Günther Prien
Ingeborg Prien
Oberleutnant Thomas von Birkeneck
Der Smut
Alwine Kille (as Ute Hallant)
Die Fürstin (as Olga Tschechova)
Kommodore
Leutnant Bluhm (as Raidar Müller)
Leutnant Raufuss
Jörg Christiansen
Kapitänleutnant Schopf
Leitender Ingenieur
Pfarrer Friedrich Kille
Self (voice)
Radiosprecher (voice)
(uncredited)
Lautstarker Matrose beim Tanz (uncredited)
Stabschef (uncredited)
Richards (uncredited)
Gefängnisdirektor (uncredited)
Maat Piontek (uncredited)
Admiralstabsoffizier (uncredited)