At 55 hours, 54 minutes, and 44 seconds into the mission, the pressure stood at 996 p.s.i.—high, but still within the accepted limits. One second later, it peaked at 1,008 p.s.i. By 55:54:48, it had fallen to 19 p.s.i. During those same four seconds, the temperature in the tank went from –329 to +84 degrees Fahrenheit. If one of them had seen the pressure continue on through the outer limits, then plunge, he would have been able to deduce that O2 Tank 2 had exploded. It would have been a comparatively small leap to hypothesize that the explosion had damaged the piping from the second O2 tank
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