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Complexity. now, annex 13 says that the court or the airline is responsible when there's multinations involved, that the airline is responsible to pay for the damage to the passengers and families. but, again, there has to be a proof of loss. so we're still waiting for that proof of loss. >> tim, they seem to be ruling out the fifth ping as coming from the black box beacon. so now we're back to the square where we had four pings i can approximated up days ago. how realistic is it that you think they will pick up more pings now that they've had resources in the area for a while now? >> well, it...

Wreckage, how hard will it be? they will have to use cables. what's the system here? >> well, just last year expeditions brought up the f-1 rocket motors from apollo 11 and 12 from similar water depths, actually a little deeper. that was a successful operation. it's obviously something that can be done. >> all right. mike williamson. >> these are the trained specialists trained to knock everything out and listen for that ping. one set back. plus another big developing story we are following. >> get back. get back now! now! >> dramatic video of a very tense stand off in nevada.

Background. still, we don't know who was in control of the plane at the time. >> joe johns, thank you very much. erin mclaughlin there's been another possible ping heard. how is the search changing based on the latest signals? >> i have lost my feed. >> apparently having trouble with her. that happens when it is live. how has it changed since it is 18,000 square miles and the fifth ping. >> every time they get another ping, it increases the certainty that what they found is the right thing and that allows them to decrease the area that they are searching in. we haven't had this fifth ping conf...

Remarks saying essentially there's been no major breakthrough. however, he said that the search area has significantly narrowed down to about 18,000 square miles, which is still a big patch of ocean, of course, but it's much smaller, much more manageable than the 80,000 square miles that were being searched for pings over the course of last week. much, much more manageable area. also on the downside, i suppose, you may remember yesterday there was a fifth ping identified by an australian aircraft flying over the area where the search operations were under way. that's been now ruled out as not ...

His words, very confident, the signals that have been detected are, indeed, from the plane's two black boxes. he says the challenge is to get as much information as possible before the signals end. investigators say a fifth ping is probably not from the plane. it was picked up thursday by a device dropped in the ocean from an airline before earlier signals were detected by a u.s. pinger locator towed by an australian ship. there's been no letup in the search for debris from the plane. looking at the surface, 13 ships, 15 aircraft, they're assigned to today's search. more now on what australia'...