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Mh370 ended its flight in the southern indian ocean. that's the official statement and that's then and the plane is lost. this debris simply confirms what the malaysian government stated way back last year. and the university of western australia is now working on a reverse drift analysis of this piece of debris and they are hoping that's going to give some guidance to the searchers of a tighter area to look where this may have come from. >> jeffrey, so a cautious optimism about this piece of debris. again, pointing back to the news conference we heard a short while ago, deputy prime minister ...

How many clues in the reengineering process does it begin to give? >> i think, first of all, you've got the reverse drift to take you back to roughly the same area where they are already searching. then you have the barnicles and sea damage that will tell you how long it was in the ocean for. and that helps you. but they already believe, because of the data they are in quote, the right area. but that right area is vast and 120,000 square kilometers. 56,000 square miles. can they get it any closer john, as a result of this piece of debris? the answer is no. it does not take them to where x mark...

Tom says, doesn't tell us why. we know they're searching. while you and i are talking now, there is a ship that is sear searching part of the 120,000 square kilometers authorities have designate the as the most probable area. 1500 miles southwest of perth, western australia. so the search goes on. and if this is part of mh-370, wolf, it redoubles the effort in many ways. but it doesn't tell us with any greater certainty exactly where it was. you are still left with the handshakes. frankly as peter says you are going to reverse drift it. but you are still left exactly where you are believing it...

They had to get a ship out to verify. i guess they'll be able to sort of triangulate based on currents how far people have gone. >> right, the phrase is reverse drift. they will know with great detail the way the current was moving at different levels. the surface, the mid, and the lower levels. they'll be able to work out how far. but we see so much debris the seat the bodies the portholes, the part of the window section we saw. we see so much wreckage in a particular area that now they can do this modelling to quite a very sharp level of accuracy. that doesn't mean it's going to be -- it tak...

It would have a 90-day battery. it changed to make every one manufactured past the day. 90 days. may have a reprieve. i have a message in to confirm that or not. >> david gallow one official is, thought that perhaps the black boxes could be buried by mud. just how much would that or potentially could hat muffle the sound of pings. could it make it so they couldn't be heard at all? >> yeah. it could potentially muffle the sound. i don't think enough that it would be take away too much from the range which would be one, two two miles. just from what i know. i don't think. very much. >> interesti...