One of the thigns I read early on about the cementing, was that Halliburton was cementing the well based on the well being @ a depth of 18,000 feet. Which was also the limit set by their drilling permit. Halliburton made calculations based on the 18,000 foot depth, and did their cementing. Problem was that the well was drilled down to 25,000 feet, 7,000 feet beyond their permit. The additional pressure at that depth required more cement than was being put in. So when they "finished", the cement had too much pressure below it and gave way. If BP had been drilling as per their permit, the cementing operation might possibly have been successful. But, true to their colors, BP wasn't playing within the rules, again.
That company needs to be dissolved. they were responsible for protecting and cleaning up Prince William Sound, but they failed. Then this. That company should not be allowed to conduct business again.