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In terms of the way that he's sort of zoned in on this critical aspect. 24rr a number of critical aspects to this investigation, and we should be setting ourselves for the long haul. >> yeah, certainly. and i think a lot of people are drawing comparisons with that air france flight. david, to you. the oceans obviously are gigantic. they're massive. but i think a lot of people were surprised to learn that this is an area that really has not been mapped. we know some of it has been because of the sonar scan of the bluefin 21. but do you think we'll have get to a point where it's easier to

Absolutely exhausted every single piece of it. that's the subsurface. the above surface is different. the maritime surveillance aircraft. >> looking for floating wreckage. >> looking for floating wreckage. they cannot equivocally tie the two together unless he gets some sort of wreckage. they are limitations not only human factors but there are also limitations on the engineering of the aircraft and how long they can supply for on various levels of servicing that have to be achieved the longer they go on. we have to treat them separately. >> fair point. they've been going at an incredible pail...

We have -- they look like pings as far as all of the different -- >> but that is to where they are now. the question if they have done the sonar scan after searching that area that they have now and we haven't found anything how much do they have to move that search area based on that ping information? >> well, they would have to go around the perimeter of where they have been searching and see whether there is anything -- anything there. not go to an entirely different area. one that is contained within or slightly -- >> several miles around? >> it can't be hundreds because the signals -- >> ...

About right now is the bluefin-21, covers about 40 square kilometers a day. that's limited by the swath, the width of the sonar scan and the speed at which the vehicle flies above the sea bed. if you start to do some of the math and you look at the area around that 17-mile ping location dimensions they talked about last week, you're looking at 30 to 60 days of survey time. so you start to think you're in here for the long haul. they have to look at whether they're searching at the right spot. there are other types that might be faster but they're less common than the bluefin is. >> is one reas...

Have run at this point, does that sound like a possibility to you, it would explain why they heard pings but not found any floating wreckage despite flying planes, searching for a number of weeks now? >> sure. that's a possibility. then remember, too, in the sullen burger styles landing on the hudson, there were various boats and other ships in the vicinity. they got lines on that plane in a hurry to keep it from sinking. not only did they make a landing there they had help. if it did make a landing, water landing, it would probably not stay afloat very long. maybe it would break up some and i...