clearly we need to pump cement. if we do it from the top we might alter what we do with the relief well. but the relief well is still part of the solution. the ultimate objective is getting this well permanently sealed. admiral allen responding, the well will not be killed until we do the bottom kill and do whatever needs to be done. i am the national incident commander and i issue the orders. this will not be done until we do the bottom kill. wait, there's more. oil industry expert bob cavnar warning us engineers might regret cementing the well from above too soon. with today's procedure, he said bp sealed off the only way it has to tell what's really been going on below the surface. something it will want to know when the company intercepts the blown-out well with the relief well. if any part of the well in between the cement plug above and relief wells below has ruptured, they will have no way of gauging the pressure to find out whether or not that has happened. that the well hasn't been killed