"Mostly" != "entirely". Also, don't forget the rocket engine itself My guess would be the explosion was of the remaining fuel in the rocket engine and tank. Ei

"Mostly" != "entirely". Also, don't forget the rocket engine itself My guess would be the explosion was of the remaining fuel in the rocket engine and tank. Either that or it wasn't actually an explosion, just burning fuel-air mix spewing about after the rocket nozzle deformed too much.