Eleven people drowned, 11 were injured and dozens more were missing on Monday after a malfunction at a Siberian hydroelectric plant trapped workers in a flooded chamber. Divers pulled two people from the space below the plant's main turbine hall, but feared that many more remained trapped inside. 'We are trying to find out the fate of 72 people,' Andrei Mitrofanov, the plant's chief engineer, said after an emergency meeting with Prime Minister Vladimir V. Putin in Moscow on Monday evening. It will take about three to eight days to drain the water from the flooded areas, officials said. The accident shut down the Sayano-Shushenskaya hydroelectric plant, Russia's largest power generator, in the Khakassia region of Siberia. It cut power to five major factories and to residents, who rushed to stock up on foodstuffs and gasoline. Vitaly Zubakin, the acting chief executive of RusHydro, which owns the plant, said restoring the damaged plant could take 'four years, or even longer.' The company expects to incur monthly losses of 1.5 billion rubles, or about $47 million, per month as a result of the accident. The plant's towering dam was not damaged, and Emergency Situations Minister Sergei Shoigo reassured residents that there was no danger of widespread flooding. Within hours, the damaged plant had released an oil slick covering 10 square miles on the surface of the Yenisei River, the Natural Resources Ministry said. Vladimir Markin, a spokesman for Russia's general prosecutor's office, told the Itar-Tass news service that the accident occurred when a transformer exploded during repairs, cracking the walls and ceiling and causing water to fill an engine room. But RusHydro officials said the flooding was caused by a surge in hydraulic pressure, which they believe was caused by human error. The loss in power supply to the area will be made up by burning coal, company officials said. 