The huge nuclear disaster hidden by the Soviets

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In 1957, a massive nuclear accident took place at the top secret Mayak nuclear station in the Soviet Union. At the time, it was the largest nuclear disaster in history. So why has no one heard of it? Despite its size, Soviet authorities managed to keep the accident a secret for almost four decades, and details of the devastating legacy of what is now known as the ‘Kyshtym disaster’ are still only just becoming clear today.