A make-shift cover -- the 'Sarcophagus' -- was built in six months after the explosion. It covers the stricken reactor to protect the environment from radiation for at least 30 years. This has now developed cracks, triggering an international effort to fund a new encasement. * Ukraine is seeking a further 600 million euros ($840 million) to help finance the new convex structure which will slip over the aging 'Sarcophagus' and allow the old reactor to be dismantled The Chernobyl Union of Ukraine, a non-government body, estimates the present death toll from the disaster at almost 734,000. How will Japan cope with the shortage of living space if an exclusion zone is placed around large areas of Japan ?