Apollo 1 Capsule Data

 "The Apollo 1 fire originated to the left of Gus Grissom's couch at the bottom of the lithium hydroxide door where a bundle of wires arced due to chaffing and or cold flow and ignited the nylon netting. Cold flow is where the Teflon insulation deforms and exposes bare wire as a result of pressure being applied to it. Once the nylon netting ignited the interior of the spacecraft it became, essentially, a bomb due to the 100% pure oxygen. Temperatures in places within the spacecraft reached a level hot enough to melt stainless steel! Gus Grissom was out of his seat at the time changing his cobra cable. He jumped up form his couch on his hands and knees, bumped his head on the instrument panel, and then thrust his arm through a wall of flame to activate the cabin dump valves.  Simultaneously,  the pressure within the spacecraft got so high that the cabin ruptured on Chaffee's side. Gus then helped Ed White lower his headrest and tried to assist Ed in opening the hatch. By this time the fire was out but both Gus and Roger were overcome by poison gasses because Gus's suit breached. Ed White was not affected as he had disconnected his oxygen inlet hose. Gus and Ed were found tangled and fused together on the floor beneth the hatch with their arms still reaching for the hatch. Roger

Chaffee remained in his seat. Progress was made on opening the hatch

but, by now, all three astronauts were overcome by smoke inhalation."

Mr. Boos 2017