Well, forget my statistical analysis prediction and consider this fact. The water pressure right at the well head at a mile deep is about 2,300 psi.

So, the oil is trying deperately to escape from the deposit at a much greater pressure than 2,300 psi, otherwise it would be a stalemate and the sea water would stop the flow all by itself. That drilling rig was probably pumping very little if any when it exploded. It was only controlling the vertical flow of oil through the pipe, oil that was already discovered.

Apparently, it failed even while trying to do only that.