
The action takes place during the Second World War in the battle zone over the Black Sea coast. Soviet sailors track down an enemy submarine. Meanwhile, the commander of the Sea Hunter, along with one of the sailors, is not returning from intelligence. Young patriots Katya and Lida report to the boat about the signal of unknown friends who noticed a submarine. Thanks to this, Soviet sailors drown an enemy boat, and the brave reconnaissance Katya, who knows the mountain paths of the coast well, discovers a Sea Hunter commander and a seriously wounded sailor in one of the caves ..

as Katya

as Makar Makarovich

as leytenant Korolkov

as Mariya Vasilyevna

as Ivanov, acoustic technician

as kapittan-leytenant Aleksandr Nikolayevich

as Cook

as Kazachenko, sailor

as Sailor

as Manya

as Lida

as Petya

as Matros

as Sailor

as German officer