On March 11, 2011, an earthquake and tsunami triggered the Fukushima nuclear disaster, the worst nuclear accident since the 1986 Chernobyl disaster, which led to three nuclear meltdowns, explosions and the release of radioactive contaminants.In 2012, TEPCO admitted that it failed to take the necessary measures at the time for fear of protests or lawsuits over the accident at the plant. Even after the accident, TEPCO was instructed not to use the term "core meltdown" in press conferences. The Economist reported in 2012 that operators had made a mistake and the regulator had failed to monitor the situation, and that representatives of the safety inspection agency had run away. Naomi Hirose, president of TEPCO, told the media that all the government did was cover up the facts. It wasn't until 2013 that TEPCO had to admit that it could no longer hide the leak because "groundwater near the Fukushima Daiichi plant was leaking into the sea". In fact, in 2012, a screening program showed that more than 36% of children in Fukushima Prefecture already had abnormal thyroid growth. And the Japanese government, as in the case of Minamata disease, chose to conceal the true situation. As a result of the deception, cover-up and poor response, the Fukushima nuclear disaster evolved all the way from an initial Level 3 to a Level 7, and before that, the Chernobyl nuclear disaster was the only Level 7 nuclear accident in the world. And it ultimately resulted in a large number of people becoming ill or dying. #nuclear