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>> we don't know, do we? not yet. >> we don't know but i think it's extraordinarily remote possibility. just to clarify one thing about the black boxes. there is really two parts to this. one is the voice recording part which is two hours as tom said and does potentially go longer. the data recording, every move goes to the end and that will prove useful. >> i know you don't me to go there. kerry sanders wants to jump in. he has got a bigger sense of the search area. i guess we should look at the very wild theory of potential places where the plane could have gone down on land. take it away wh...

Flight. and over that flight they can cover 10, 11, 12,000 square miles. so when you plook at the xpans, that is the indian ocean, that's why you want the p- 3 and p-8 out there. >> i know the posiedon has the most advanced equipment. dove do they have the ability to run 24/7. >> they are not limited to daylight. they used a very advanced surface search radar and night vision and infrared. so to detect anything on the surface of the water like debris, for example, really all they need is their radar and they will pick it up. >> this is such an enormous

The problem with those microphones is you still need to know where to look. jenna. >> still a big mystery. thank you very much. search and rescue scouring indian ocean for a third straight day. more than 1,000 miles off southwestern australia. that's the area where a satellite spotted what we talked about earlier. piece of debris, is it the plane or not? that's the question. michael kay an experienced military pilot joins us to take a look at the maps. when do you know, mike, this is the area to look and when do you know it's not and have to pull back. >> an impossible question. sadly, jenna...

Latest updates on this topic from reliable sources.

Even been mistaken for the debris from flight 370, shipping containers that have fallen off ships. technologically how would you determine the difference between a false lead, something that fell off a cargo ship, and a piece of a plane? >> well, the difference occurs between the surface middle level layers of the ocean and the bottom. and different technology is used for all three. radar and night vision, infrared is primarily used for the surface and the p-3 and the p-8 orions use this type of technology. in the middle regions of the ocean they use sonar buoys to detect any subsurface debris...