The story of Ermak Timofeevich, whose campaign for the Ural mountains served to annex the Siberian lands to the Moscow kingdom, in the second half of the 16th century.
A detachment of Red Army soldiers is ambushed, from where only the boy can escape.
The chief engineer proposes to make changes to the design of the polar hydroelectric power station by abandoning the construction of the tunnel due to a collapse.
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