All reactors at the plant reached cold shutdown by March 15, 2011. In June 2011, 7,000 tons of seawater from the tsunami were still in the plant. TEPCO planned to put it all back into the ocean. But, about 3,000 tons of the water had radioactive chemicals in it. Japan's Fisheries Agency did not let TEPCO release the water back into the ocean. Japan's Prime Minister said the nuclear emergency at the Fukushima Daini plant was over on December 26, 2011.