It was determined that a spark from a short circuit in a group of wires that went to the left and right of Grissom's seat was the most likely culprit which was the cause of apollo 1 accident.
The cabin's substantial amount of flammable material combined with the oxygen-filled air allowed the fire to start and spread swiftly. Over the course of the following 18 months, a number of changes were made to the programme, including the creation of a new hatch that opened outward and could be operated quickly, the removal of a lot of flammable material and the replacement of it with self-extinguishing components, the use of a nitrogen-oxygen mixture at launch, and more stringent documentation of all changes and oversight of all design changes. apollo 1 accident is one among the biggest disasters in spaceflight history
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