Svir river views; Lake Onega. Construction of the Svirskaya hydroelectric power station (Leningrad region). Excavation, construction of a cofferdam across the Svir River. Types of the building of the hydroelectric power station, the concrete part of the dam, the sluice. Turbine installation. Flooding of the tailwater, analysis of the cofferdam. Construction machines are in operation: excavators, bulldozers, dredgers. Blocking the right channel of the Svir River. Dump trucks are throwing stones and concrete blocks into the river. Completion of the construction of the panel room of the hydroelectric power plant, the concrete part of the dam. Technical advice for the construction of a hydroelectric power plant. Present: head of Svirstroy Poddubko, chief construction engineer Neporozhniy, head of construction department Strokov. Rally of the builders of the Svir hydroelectric power station on the occasion of the launch of the water of the Svir River through the structures of the hydroelectric power station.