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Centralizers than some folks were recommending. is that -- i'll leave out motortation but there was a choice of more centralizers or more. more costs more, fewer costs less. which choice did bp make? >> the decision taken by the engineering team at the time, which was a technical judgment, was to use fewer centralizers rather than more. it's not always true more is better. >> bp chose at deepwater horizon not to circulate drilling mud that would have cleaned out the well. it chose a lighter saltwater based for the cementing procedure. is that correct? >> the procedure to displace the mud was a...

I'll ask you again, there were fewer casing centralizers than some folks were recommending, is that -- i'll leave out motivation, but there was a choice of more casing centralizers or fewer casing centralizers. more costs more, fewer costs less, which choice did bp make at deep water horizon? >> the decision taken by the engineering team at the time which was a technical judgment was to use fewer centralizers rather than more. it is not always true that more is better. >> and bp chose at deep water horizon not to circulate drilling mud that would have cleaned oud the well, it chose a lighter s...