Remarks attributed to Elon Musk in which he discussed a possible cause of SpaceX’s Falcon 9 launch pad firexplanomaly leaked out to the public last week after his his presentation before officials at the National Reconnaissance Office (NRO).
“We are close to figuring it out. It might have been formation of solid oxygen in the carbon over-wrap of one of the bottles in the upper stage tanks. If it was liquid it would have been squeezed out but under pressure it could have ignited with the carbon. This is the leading theory right now, but it is subject to confirmation,” Musk is reported to have said.