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The report said it wasn't clear if the astronauts were already dead or just unconscious from the lethal lack of cabin pressure before the blunt force of the spinning out-of-control shuttle would have killed them. The report detailed five "events" that were potentially lethal to the crew.
The Columbia depressurization event occurred so rapidly that the crew
members were incapacitated within seconds, before they could configure the suit for full protection from loss of cabin pressure. Although circulatory systems functioned for a brief time, the effects of the depressurization
were severe enough that the crew could not have regained consciousness. This event was lethal to the crew.