Icebreaker "Krasin" at sea; the head of the expedition, Professor Samoilovich, talks with the participants of the expedition. North Caucasus. Construction of a new grain factory "Gigant", residential buildings for workers in the Salsk district; arrival of tractors and other agricultural machinery; first sowing on the farm. Salt mines in the vicinity of Evpatoria: extraction, transportation of salt. Moscow. Construction of new residential buildings, new settlers move into new apartments. Construction of the Zeppelin # L3-127 airship in Friedrichshafen, Germany.