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One bp executive compared this to a giant faucet. they crank it down and turn it off and the flow essentially stops. is that a good anology? is that how it's going to work? >> that's pretty much the way it works, chris. they will gradually close in the well to see how much pressure it could take. there's two issues here. one is the strength of the old blowout preventer stack and that flex joint that's on top that the new cap is sitting on, but it's also very, very critical that the casing down below stay in tact. you recall during the top kill over the memorial day weekend there was a lot of c...

It opens and it allows them to close the well gradually rather than slamming it shut. >> as they start this process again, is there still a chance that this thing could erupt or explode or that the whole thing could somehow backfire? >> well, there are a number of things that could happen to cause it to backfire. obviously, the down hole damage that we all believe has occurred during the top kill in the blowout itself are certainly risks. also, there are components between the old blowout preventer and the new blowout preventer that are not rated for these kind of pressures that they're talkin...