Nine volunteers begin digging a tunnel through rugged mountain terrain. The group includes three miners. The others have come from different parts of the country for different reasons. When winter comes, a blizzard makes the road impassable and the truck with supplies cannot reach them in time. With only a hundred metres to dig, the tunnel collapsed. Everybody leaves the construction site, except the communist Damjan. In town they check in at the mine and are due to start work in two days. During these two days, one by one, they are overwhelmed with shame for leaving the tunnel, and finally return to Damjan to finish their work despite all the difficulties.

An entire town rallies to help save a young boy after he becomes stuck in a river.

The former partisan, officer Petko, became the chairman of the collective farm, establishing the cooperative economy, to overcome the resistance of kulaks and slackers who “ruined the economy“, and how with the help of friends Petko managed to unite people and establish work.

The university student Bobchev joins a youth brigade. The commander's council entrust Bobchev with a literacy course for members of the brigade. Velizarov and Monkata arrive in the camp to carry out sabotage. They place explosives on the dam, and attempt to win Bobchev over by means of intrigue. There is a storm: the camp is put on the alert. Everyone joins the rescue work at the dam. After a long struggle with Velizarov, Bobchev cuts the burning fuse of the explosive. The dam does not yield to the pressure of the flood. Everymen sing in Jubilation.