Popular science film about the problems of permafrost, seismic hazard, the development of new zones in Siberia in connection with the construction of the Baikal-Amur railway. Scientists: S. S. Kutateladze, A. V. Nikolaev, A. K. Belyaev, F. A. Reimers, A. A. Trofimuk, A. G. Aganbegyan give interviews (synchronously). Landscapes of Siberia at different times of the year. Construction of the Baikal-Amur Mainline. Permafrost Institute in Yakutsk. Meeting of the Academic Council. Institute staff at work, conducting research. Landscapes of Lake Baikal. Institute of Geology and Geophysics, Siberian Branch of the USSR Academy of Sciences. Institute of the Earth's Crust in Irkutsk. Hydroelectric power plants. Movement of the boat along the river. Institute of Plant Physiology and Biochemistry, Siberian Branch of the USSR Academy of Sciences. Experimental sites and laboratories of the Institute. Biological station of the Siberian Institute of Cytology and Genetics. The staff are watching the animals. Institute of Economics and Organization of Industrial Production of the Siberian Branch of the USSR Academy of Sciences.