The Sayano-Shushenskaya hydroelectric power station is the most powerful in Russia and the sixth largest in the world. It was built during the Soviet Union from 1963 to 1978 on the Yenisei River in Siberia. In 2009, one of the world's largest man-made disasters occurred at the hydroelectric power plant, which claimed the lives of 75 people. It took five years and 40 billion rubles to resume the operation of the station. And although the exact cause of the accident has not yet been established, the engineers accused of the accident have been imprisoned.