REUTERS/Nuclear and Industrial Safety Agency/Handout
A view of a crack leading to a damaged pit at the crippled Fukushima Daiichi Nuclear Power Plant No. 2 reactor in Fukushima prefecture, northern Japan April 2, 2011 in this handout photo released by Japan's Nuclear and Industrial Safety Agency on April 3, 2011. Japanese engineers grappling on Sunday to end the world's worst nuclear crisis since Chernobyl tried to seal a crack that has been leaking radiation into the ocean from a crippled reactor. Picture taken April 2, 2011.