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Scanner sonar and other submersibles and it took them 2 1/2 years to find it and they sort of knew the area where they were looking. >> that's right. they had a point to start with with air france 447. they recovered a little bit of wreckage. they had more clues to work with in that search. the towed pinger locator was also used and did not find the black box. it went right over it and didn't find it. officials at phoenix international say that's because the pinger became separated from the black box and they had become damaged but it was similar to the bluefin-21 and it wasn't exactly like th...

Generally here. >> correct. >> it's a large area, still, that we're talking about, like 500 square miles. but the mission today that the bluefin is going to be taking on, they're starting at 40 square kilometers, 15, 16 square miles? >> right. and again, that's focused on this line -- oops -- >> that's okay. pick a color. any color. >> all right. so let's go out for a second. and this line is two hours, they have that ping. >> okay. >> now, think about that, as to where within the pinger would be, it has to be within that circumstance that i drew before. so it has to be within a circle that's ...

Answer very quickly. it usually takes integration of a lot of different sources and information. some smart people thinking about it, who understand what these pieces mean and a deliberate search effort that may take year, i'm sorry to say. >> mary schiavo, same question to you. >> well, i think the significance is not only with the, you know, the pings and the difficulty in finding them and the demonstration was great to show us how difficult it is, but here they have two different black boxes that they're searching for. and first they told us they might have had both of pinger, and now it's ...

Debris from the plane, if it's out there and until they get that, it doesn't seem like we're going to get a lot more information from them, at least at this stage. >> joe johns, understood they are frustrated and probably warn out a bit and all they want is some solid information. you know, joe johns mentioned debris, david. listen, this so no confirmation of debris but angus houston did mention an oil slick in the area of where they heard the possible pingers and said they collected a couple of liters of it and they are analyzing it. what do you make of this, we have the inmarsat data, we hav...

Hours to return, and four hours to down load images which are high resolution image of the area searching 4.500 meters. so that is about 2.8 miles underwater. and the terrain is very difficult. it's an area that is, he says quote new to man. it's flat and rolling. a lot of silt on the bottom. it can be layered and very teep which will complicate the search. it is a final step towards making a visual determination. said they have not heard a detection from the pinger since tuesday. is six days now. those batteries are only expected to last about 30 days he says they continue to search because t...