History of Space Exploration: Chapter 5, Exercise 1 — Possible Solution
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CAUSES IDENTIFIED
Ignition source (hedged: "likely" electrical arcing, "possibly" coolant
electrolysis); pure oxygen at 16.7 psi; an inward-opening plug hatch; 34 square
feet of Velcro and nylon; and a test judged non-hazardous with inadequate rescue.

TWO CHANGES
A 60/40 oxygen-nitrogen launch atmosphere, and an outward-opening hatch operable
in under five seconds (also Beta cloth suits, self-extinguishing materials).