A production conflict breaks out between the head of the hydroelectric power station's construction, Demidov, and the chief engineer, Prokofiev. Prokofiev prohibits construction work due to the danger of a rock collapse, but Demidov cancels the engineer’s ban.
| Actor | Role |
|---|---|
 Oleg ZhakovDemidov | Demidov |
 Aleksandr BelyavskiyProkofyev | Prokofyev |
 Irina KorotkovaSvetlana | Svetlana |
 Anatoliy SolovyovMitrozhkin | Mitrozhkin |
 Svetlana SvetlichnayaIrina | Irina |
 Aleksandr KharitonovVerkholaz | Verkholaz |
 Mikhail RemizovVerkholaz | Verkholaz |
 Maya BulgakovaNot listed | Not listed |
 Tatiana RasputinaNina | Nina |