because on april 15th, there's a document which is five days before the blowout, that said using the safer liner will add an additional seven to $10 million to the completion cost. the same document calls it the single string of casing, the best economic case for bp. and the conclusion i draw from these documents is that bp used a more dangerous well design to save $7 million. what do you think about that? what's your response? >> i believe that document also highlights that the -- long-term integrity of the well will be better served by a long string. the long string is not an unusual well design in the gulf of mexico. as i understand it -- >> say that again? >> a long string is not an unusual design in the gulf of mexico. >> as i understand it, the halliburton witness, who was interviewed by our staff, had