Irkutsk region. Bodaibo district. July 1, 1957. The Mamakan River at the confluence with the Vitim River. Ships at the pier. Unloading cargo for construction. Preparation of the geological party of the Vitimopatom expedition for the passage up the Mamakan River. Geologists LB Revyakin, VP Tikhonov, VM Utushkov and others at work. The territory of the future dam. Construction of residential buildings for the builders of the hydroelectric power plant.