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1975 Banqiao Dam Failure; Massive Catastrophe in Henan, China

On August 8, 1975, the Banqiao Dam in Henan, China, failed following extreme rainfall from Typhoon Nina. The failure triggered a massive flood that caused multiple downstream dams to collapse in a domino effect. Estimated deaths range from 26,000 to 240,000, making it one of the deadliest dam failures in history. The disaster was kept secret by the Chinese government for decades before being declassified.