Extraordinary flood peak is about to impact the temporary dam of hydropower station. Li Guang, an engineer from China, and sviridov and Elina, experts from the Soviet Union, are checking the flood prevention preparations. Wang Demin, the person in charge of the site, and Matveyev, a Soviet expert, visited the flood diversion area. We decided to blow up the dam to discharge flood when necessary to ensure the safety of the hydropower station project. Wang Xiao and Kalia's parents were very worried when they learned about it. This female reporter wants to interview Wang Deming and Matveyev, which reminds them of the first meeting, when Matveyev rescued Wang Demin from the white bandits ... The train that Wang Demin's son Wang Xiao and expert sviridov's daughter Kalia took was blocked by the flood, and they were in distress and washed away by the flood. The secretary of the municipal party Committee comforted his parents and sent someone to find them. In the process of fighting floods, Wang Demin and Matveyev recalled many past events in the years of common fighting. After everyone's tenacious struggle and unremitting efforts, Wang Xiao and Elena were finally rescued, an unprecedented flood was conquered by everyone, and cheerful songs sounded on the hydropower station site.