NASA has published their
report on the Columbia disaster's crew.
Although no quantitative conclusion can be made regarding the cabin depressurization rate, it is probable that the cabin depressurization rate was high enough to incapacitate the crew in a matter of seconds.
[snip]
These findings strongly suggest that despite the very dynamic vehicle motion, the [pilot] was still capable of taking appropriate actions to attempt a recovery of the hydraulic pressure by performing a [hydraulic] restart...
...Based on the panel R2 switch throws and the lack of visors being lowered, it is probable that the crew never realized that the vehicle LOC situation was unrecoverable and had become a survival situation.
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