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It was never concluded exactly what was the source of ignition in the Apollo 1 fire. However several mitigating factors led to the disaster. A pressurized 100% oxygen atmosphere inside the cockpit virtually guaranteed that any small spark would result in catastrophe. Additionally many materials used inside the cockpit while not flammable in normal atmosphere were discovered to be highly flammable in an oxygen-rich environment.

The pressurized cockpit also meant that the inward-opening hatch could not be opened quickly in an emergency.

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13y ago

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