Diver Antoni Barnat is falsely accused of causing an accident underwater that almost led to his fellow diver's death. Interestingly enough, they are both in love with the same girl, Teresa.
| Actor | Role |
|---|---|
 Zbigniew JózefowiczAntoni Barnat | Antoni Barnat |
 Zbigniew CybulskiRafał Grabień | Rafał Grabień |
 Urszula ModrzyńskaTeresa | Teresa |
 Antonina BarczewskaNurse | Nurse |
 Mieczysław GajdaCrew Member | Crew Member |
 Stanisław JaworskiDoctor | Doctor |
 Jerzy KaczmarekJurek | Jurek |
 Janusz KłosińskiShip Captain | Ship Captain |
 Roman KłosowskiWacek | Wacek |
 Adam KwiatkowskiPałamarz | Pałamarz |
 Józef ŁodyńskiRadiotelegraphist | Radiotelegraphist |
 Lech MadalińskiCzeluśniak | Czeluśniak |
 Konrad MorawskiDiver | Diver |
| JJadwiga ProlińskaIrena | Irena |
 Czesław PiaskowskiAdam | Adam |
 Roman PolanskiRomek | Romek |
 Andrzej SzalawskiGerman Mechanic | German Mechanic |
 Władysław StaszewskiOrbach | Orbach |
 Henryk StaszewskiCrew Member | Crew Member |
 Kazimierz WichniarzFeluś | Feluś |
 Zygmunt ZintelMundek | Mundek |
 Seweryn ButrymGerman Officer (uncredited) | German Officer (uncredited) |
 Jarema StępowskiDrunk (uncredited) | Drunk (uncredited) |
 Gustaw LutkiewiczSinging German Officer (uncredited) | Singing German Officer (uncredited) |
 Tadeusz TeodorczykGerman Soldier (uncredited) | German Soldier (uncredited) |