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But the search area around where the pings are is a lot more concentrated. it is less than a thousand kilometers. they do say at walking pace which is what the bluefin does it could take six weeks to more than a month to cover the search area. you know, bill, you mentioned that oil slick that was near the ocean shield vessel. and they have brought that back to shore. it took a while, you have to think, it is a thousand miles off the coast, 1600 kilometers. they had to get a ship out to the area, fly that back with it, get that to shore with the helicopter to fly off. so the logistics here are ...

To this very spot and guess what? they get very strong pings. for him, for a wreck hunting expert, that is proof positive. he was probably about to say something similar when he stepped back and said we're very confident. there is a very high level of confidence that they are onto the final resting place of flight 370. >> all right, hello, now, to mary schiavo, the pings have likely gone dead. did we get enough information from those to warrant this type of confidence? >> well, actually, ordinarily you would want to have a lot more for a greater extended period of time. but i think the confide...

Square kilometers and the data from the latest mission is being analyzed. the oil sample collected by ocean shield has arrived in perth and is being analyzed, as well. we will bring you the results as soon as they become available. back now with my panel of experts to answer your questions. jeff wise, we have a question from susan. it says why not take one search plane and research the flight path. maybe they would spot path. you know you retrace your own steps when you lose something, just a thought. is that a common seance approach. would that be helpful to do that with the data we have? >> ...

The first piece of debris, if you like, we find from flight 370. >> but i want to get your thoughts on this, geoffrey. underwater recovery expert told us i think essentially they have found the wreckage site. and he has been on this show with us before. you have spoken with him. we all have. why are he and so many other officials so confident about this? >> well, david is probably one of the most respected wreck hunters in the world, along with people like mr. ballard. he found hms sidney off the west australian coast. he is very experienced with the sort of forensic clues that you will get. a...

Four dives. has it brought any clues to the surface? cnn's justice correspondent pamela brown is joining me now with the latest. four dives? what has the bluefin found, if anything? >> it has searched 46 square miles. it's dived 15 feet down and sonar images are being studied and so far no airplane debris. searchers are talking about regrouping if they don't find anything in the next few days. four days of searching under water and new sonar images are crystal clear. but don't show any wreckage. the underwater robot, bluefin-21, has been searching the area where the "ocean shield" detected pin...