judgments were taken. >> so would you call that a bottom up decision or top-down decision? >> i would say it was a decision by the right expert with the right knowledge to make the decision. >> in your testimony you note you're currently drilling two relief wells which will stem the flow of oil. in previous testimony from bp and transocean we heard there are numerous redound redundancies to ensure that tragedies like the one we've seen unfold over the past 59 days don't occur. my question is this, do you view these relief wells as an on-off switch? when the wells are complete are they going to stop the flow of oil? if so, wouldn't didn't you predrill emergency relief wells prior? did you do cost benefit analysis