The beginning of the 20th century. A young engineer comes to a famous St. Petersburg financier with a bold project - using the heat of the earth's interior for the needs of industrial production. This requires a mine with a depth of at least 2000 meters, and, moreover, in a certain place on the Earth’s surface. The project receives support in the financial and industrial circles of the capital, and soon the working city of Bezmyatezhny grows near the Russian-Korean border, and construction of an ultra-deep mine begins. But the construction of such a facility is unprecedented and difficult. Serious tests await the project's implementers.