Workers who constructed the cement sarcophagus covering a Chernobyl's reactor, pose with a poster reading: 'We will fulfill the government's order!' in this 1986 file photo next to the uncompleted construction. Thousands of the workers , who took part in the cleanup of Chernobyl have died from the after-effects suffered during the work, according to information from the 'Union-Chernobyl-Ukraine' .(AP Photo/ Volodymyr Repik)