Changcheng 361 Crew Suffocation

In 2003, when fishermen spotted a periscope above the surface, they discovered the Chinese Ming III-class submarine Changcheng 361 adrift. They found all 70 of the crew members dead. An investigation revealed that the submarine's diesel engine had used up all available oxygen. The crew, slumped over at their stations, appeared to have died before becoming aware of any issue.

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