July 31, 2011
What exploded on Heidfeld's Renault?
Nick Heidfeld pulled over right after his pitstop during the 2011 Hungarian GP, with his Renault engulfed by fire. The first official word was that the forward exiting exhaust had somehow broken and overheated the bodywork. But if you look at the clip after the jump you can see a fairly massive explosion which appears to injure one of the marshals trying to put out the fire.
What blew up? it's not due as the file cell is not in that location and there was no fire with the explosion. Could it have been a KERS battery? thoughts