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Kyshtym accident. One of the largest nuclear disasters in the world. It happened on September 29, 1957. At the Mayak chemical plant in Chelyabinsk-40, an explosion of radioactive waste occurred. Radioactive substances have spread to a distance of about 350 kilometers from the scene of the accident! Thousands of people were conscripted into liquidation, even more relocated … How many people died from radiation are still a mystery.