In 2003, a Chinese Submarine Was Lost at Sea. How the Crew Died Is Terrifying.*(link to article from
National Interest embedded in headline)
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361 was running its diesel while snorkeling when high water caused the air intake valve to close—or the valve failed to open properly due to a malfunction. However, its diesel engine did not shut down as it should have in response. You can find what appears to be a translated version of the article here.
Apparently, the motor consumed most of the submarine’s air supply in just two minutes. The crew might have felt light headed and short of breath during the first minute, and would have begun losing consciousness in the second. The negative air pressure also made it impossible to open the hatches. A 2013 article by Reuters repeats this theory as well as mentioning the possibility that was exhaust was improperly vented back into the hull to fatal effect.
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Any of these explanations would reflect serious failings in both crew training and mechanical performance.
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