Catastrophic Failure of Chinese Nuclear Submarine: What We Know

Chinese nuclear submarine incident led to 55 deaths

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Occurred in the Yellow Sea on August 21

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Submarine identified as 093-417 with torpedoes

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China denies the submarine loss

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Captain and 21 officers among the casualties

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Submarine caught in a 'chain and anchor obstacle

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Systems failure required six-hour repair

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Oxygen systems malfunctioned, causing deaths

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Concerns about potential water contamination

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Type-093 attack submarines designed to be quieter

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