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Pinger, the signal coming from the black boxes contain pg the flight recorders. these beacons are designed to be activated if they send extreme deceleration or impact. experts say there are other possible scenarios with the missing plane where the elts would not have worked. >> if the plane crashed with too much velocity into the surface so that the entire plane is disintegrated also if the plane lands gently enough for instance if the plane is set down gent ri enough that there wasn't sufficient g force to activate the elts. >> other reasons why the beacons wouldn't have worked. a crash could...

Indicates it's the close e to the pinger, but obviously that wasn't the case. while i'm saddened that the families will have to wait longer i'm anxiously awaiting the results of the next area where they'll search to the north. that's why we had the two-hour length ping receptions so that to me in my mind would be a really good place to look and i think that's going to present some challenges as rob could probably tell us about, but it's a little bit deeper than before. >> what are some of the challenges in your view, rob? >> the challenges are depth, as david says. we're going to a deeper part...

Confidence that they can go forward, even if the malaysian resources run thin. >> after hearing the acoustic signals, the pinger, he believed it was from the missing plane. what is your take on the fact nothing, nothing has been found? >> it seems extraordinary there's no floating debris given the assets to search in the area. but, the fact they perceived a beacon, which is almost certainly from one of the two recorders, if not both of them, it would have to be fairly close to there. these are very short range, only 9 kilometers or six miles. i expect they will find something in the short term...

Regrouping. you know, the ocean shield has been out there for quite a while. it's got to come back. get fuel, supplies. i think there are better assets that have been discussed by other analysts that need to go back in the water. but we need to complete the other 5% of that search at this point in time. >> mary, i'll ask you the same question. what fresh ideas should we be looking at as our options? >> the same thing that les said, but i would also want to know, you know, we have heard so much about the fact the ocean can play tricks with sound and now we are curious about whether the 33.5 rea...

Find air france. bluefin-21 is only on its 14th mission right now. if you're a pespessimist, as on u.s. official told reuters, then you're saying this is going to take years. they don't have a real idea where this plane is. it's only an educated guess. a good educated guess, with a series of mathematical ecase qus and trial and error. so far bluefin-21 is on its 14th mission. about 95% of the initial search zone, located about six miles around pinger location number two. pinger number two was the strongest signal that ocean shield detected a few weeks ago. if they don't find anything, and so f...