Bad weather, farmers who do not allow the dumping of their estate, and people who are willing to sabotage for ideological reasons, disrupt the building of hydro-power on the Neretva river. Upon completion of construction, the benefits of electricity assures people of the necessity of progress.

Milivoje Živanović
as Petar

Vera Ilić-Đukić
as Mara

Jovan Milićević
as Mato

Bert Sotlar
as Inženjer Černić

Joža Rutić
as Franjo

Milan Puzić
as Jerko

Jozo Laurenčić
as Ismet

Karlo Bulić
as Inženjer Šuvić

Aleksandar 'Aca' Stojković
as Radnik Antun

Branka Pantelić
as