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The fire was started by a short in the wiring. The hatch was sealed shut and the inside of the capsule was 100% oxygen which created an aggressive blaze.

Actually the command module was pressurized to 16.5psi of pure oxygen, which saturated everything in the spacecraft, giving the slightest spark the ability to start a raging fire within seconds. Things that normally wouldn't burn in standard atmosphere, burn very easily in 100% O2 at high pressure.

There were 3 hatches, the inside hatch that had to be pulled into the spacecraft and was held in place by the internal spacecraft pressure. The middle hatch that had 12 hex bolts that required the guys in the closeout room would screw closed and finally the outside blast cover hatch that was ejected with the escape tower after the 1st stage of the Apollo spacecraft was dropped off.

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