Ukraine. Province of Kiev. Chernobyl. Two workers are walking in the snow. Winter season. Chernobyl atomic power station. Nuclear power plant. 20 years after the catastrophe which took place on april 1986 at 1.23 am with the explosion of reactor No 4. It was the world's worst nuclear power accident. Reactor No 4 has been encased in walls of concrete and steels six metres thick and is now called the sarcophagus. The sarcophagus is a shelter for radioactive waste. Contamined area by radiations. © 2006 Didier Ruef