Basically, there's a step in the drilling process that was bypassed temporarily. A cement plug in the well was not put in place at its usual time. Did this have anything to do with the blowout? Who can really say? It's all speculation. One company blames the construction of the blowout preventer and its redundant safeguards, another blames the well casing, another blames it on the decision not to put in the cement plug before removing the mud. In fact, if enough gas and pressure are available, no amount of man-made structure is going to prevent a disaster. At this point, how can one quantitatively determine the explosive force of the expanding gas and mud that caused the initial incident?