 Trevor HowardCaptain Thompson | Captain Thompson |
 José FerrerMajor Stringer | Major Stringer |
 Anthony NewleyMarine Clarke | Marine Clarke |
 Victor MaddernSgt. Craig | Sgt. Craig |
 Percy HerbertMarine Lomas | Marine Lomas |
 David LodgeMarine Ruddock | Marine Ruddock |
 Peter ArneMarine Stevens | Marine Stevens |
 Graham StewartMarine Booth | Marine Booth |
 John FabianMarine Cooney | Marine Cooney |
 John Van EyssenMarine Bradley | Marine Bradley |
 Robert DesmondMarine Todd | Marine Todd |
 Walter FitzgeraldGestapo Comdt. | Gestapo Comdt. |
 Karl StepanekAssistant Gestapo Officer | Assistant Gestapo Officer |
 Dora BryanMyrtie | Myrtie |
 Beatrice CampbellMrs Ruddock | Mrs Ruddock |
 Sydney TaflerPoliceman | Policeman |
 Christopher LeeSubmarine Commander Alan Grieves | Submarine Commander Alan Grieves |
| PPat McGrathMarine Bellamy (uncredited) | Marine Bellamy (uncredited) |
| JJack CarterSoldier (uncredited) | Soldier (uncredited) |
 Andreas MalandrinosFrench Fisherman | French Fisherman |
 Judith FurseW.V.S. Woman | W.V.S. Woman |
 Patric DoonanClaridge - Sailor in Pub | Claridge - Sailor in Pub |
| YYanaWren Singer in Pub(uncredited) | Wren Singer in Pub(uncredited) |
