About young graduates of the maritime academy and their first voyage at sea. About the difficult test of professional and human endurance that had to be endured by both the crew of the trawler "Kaira," which suffered a disaster during a storm, and the crew of the rescue ship Poseidon under the command of Captain Chigrinov, where the film's hero, Slavka Chigrinov, served, demonstrating resourcefulness, courage, and bravery in times of danger.
| Actor | Role |
|---|---|
 Georgi ZhzhyonovChigrinov | Chigrinov |
 Nina MenshikovaNadezhda Vasilyevna | Nadezhda Vasilyevna |
 Yuriy KamorniyShcherban | Shcherban |
 Aleksandr KavalerovDiabolov | Diabolov |
 Vadim ZakharchenkoHead of school | Head of school |
 Tatyana ParkinaTamara | Tamara |
 Nikolay GorlovKaira's boatswain | Kaira's boatswain |
 Boris GitinSenior mate | Senior mate |
 Lidiya KorolyovaKatya | Katya |
 Liliya ZakharovaDoctor | Doctor |
 Aleksei KuznetsovEdik Kadykov | Edik Kadykov |
 Aleksei KovalyovNot listed | Not listed |
| SSlobodan KosovalićCommission member | Commission member |