>> this has been asked several times and i don't think we have gotten an answer yet, we all know about the e-mails from bp employees talking about the safety are pro-seed yours. brian morrell described the well as, quote, a nightmare well. how much were the drilling engineers consulted in the decision to use the single string casing? was this a bottom up decision in which the people actually connected to drilling the operation had some influence? or did it come from the top down? >> as i understand it, from the discussion with our investigation team and from the review of the documents, there was a discussion taking place amongst the drilli inin ining eg