A film about the expedition of Estonian scientists to Yakutia. The film was shot by film enthusiast A. Bogdanov and edited at the Tallinnfilm studio by director E. Rosenthal. Yakutia. Summer 1964. Airplane in the air. Passengers in the aircraft cabin. Oymyakon Basin. Meteorological station. Weather balloon launch. Meteorological measurements. Helicopter movement. Mountain landscapes. Mountain river. Lake Gate. Expedition camp. The members of the expedition take samples of rocks, water samples from the lake. Research vessel-sailing ship "Dolphin" on the lake. Fishing and research of fish living in the lake. Diving diver, scuba divers to the bottom of the lake. Underwater shooting. Landscapes of the lake. The members of the expedition are having dinner.