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Even put that on the divers by the divers close by a section. or remotely operated equipment. once you have that you can put those in had to find them. >> and we're looking at a graphic, we're seeing the submersible which would be scanning the southeast floor.ocean floor. how would that assist in better locating or getting a better view of those submerged. >> the sonar, most likely the side scanners on the navy vessels are lower frequency. which means they give a grainy resolution. you're not seeing specifics about the tail section. the sonars that are on the underwater autonomous vehicles tha...

Bluefin because this autonomous vehicle is used to working in deepths several miles belet surface. the bluefin 21 can dive about 2 1/2 miles but flight 370's wreckable in the indian ocean may be deeper than that. it takes about two hours for the bluefin to reach the bottom, where it can operate for another 16 hours. it scans the ocean floor as if it's mowing a lawn, aye icing side-scan sonar, which identifies objects that stand out from the seabed. when it's working with the side scanners it is not actually taking pictures, right, it's measuring sound? >> it's actually converting sound to elec...

16 hours. it scans the ocean floor as if it's mowing a lawn, using side scan sonar, which identifies objects that stand out from the seabed. . >> when it's working with the side scanners, it's not actually taking pictures, right? >> correct. it's converting sound to electricity and then turning that electrical value into numerical values and then turns it into an image. >> reporter: when it returns to the surface, scientists download the sonar data to computers. the results may look something like this. >> what we're looking at here, for example, this is a ship wreck in boston harbor. you can ...

Be fewer resources available. in your mind, when do we reach that point? >> well, certainly not yet. if air france 447 is any indication, that went on a couple years. tw 800 took four years to finish that investigation. they put hit back together. cases red heart over, between four to seven years. i don't think the investigators will give up any time soon. if they run out of clues on wreckage, i think the next place to send sonar side scanners, trailing fish, if you will, the navy's listening devices for the black boxes, and looking devices, submersibles. you can look. i would send those to th...

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