The Volga River before the start of the ice drift. Blasting ice on the Volga with explosives. The icebreaker "Ivan Susanin" breaks through the ice, brings the "Five-year-old" dredger to a safe place. Icebreaker captain MF Gotinsky on board the icebreaker, at the telegraph office. Construction of the Kuibyshevskaya hydroelectric power station: construction of an earthen dam of the foundation pit; work in the excavator pit. Hydromonitors F.I.Parshakov and P.I.Karatin are testing a water jet installation.