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
