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Again. crews will scan mile after mile of ocean on this the 37th day after flight 370 kept missing and we keep hearing words like optimism and confidence related to this search, but the pings that are thought to be from the plane's black boxes have not be detected since tuesday, that's five days leading to fears the batteries in the data recorders are becoming too weak to transmit. now, relatives of missing passengers met today with malaysian officials. one mother says she feels like the malaysian government has forgotten about all things connected to flight 370. right now the u.s. navy's ping...

Travels less quickly than it does below it or above it. there are a lot of different reasons for it. the selenity, the temperature of the water pressure, but the results are a level of uncertainty that you don't want to see in an operation like this but you have to deal with. for example, if a sound comes up like this and it hits that layer because this is slower it can bend at a very substantial level so that when it emerges it is not at all where you would expect it to be, over here, for example. in other cases the sound may come up and it may hit that layer and start pingponging back and fo...

To 30 days. so probably at 35 to 40 is where they will start to degrade to the point that the pulse or the ping won't be audible by the pi pinger rays. >> so what's the next step in trying to find the plane? >> well, they've got to narrow it down using all the hits that they have, and then visual confirmation. so once they're confident they're not going to receive anymore pings and believe the batteries are depleted, go down there and visually inspect the best area where they got the highest signal or highest possible hit and go down with one of the remote subs and visually inspect it. >> if t...

Down to about three miles down. i think we can show you some pictures. quite an extraordinary device. see if we have footage of that. there it is. what that will be able to do is called the blue fin 21, is go all the way down to the ocean bed, which is three miles down. it goes very slowly down there. it can't cover the area in the same way that the ocean shield's pinger detected it was dragging at 4,000 feet can do. so basically it will be a slow process, heavy going, but it has a much better chance of actually finding those black boxes on the ocean bed. back to you. >> dominic thanks very mu...

Doesn't use the sonar picture at all. it is actually taking a picture of the ocean bottom using sound or optics. you have to remember there are many crashes in the ocean where we never have a pinger or it completely failed. air france 447, the pingers were never heard, but they can do it. if this is clear, they will see it. >> david, regardless of which country ends up with the black boxes, there is still this issue of who is going to pay for all of this? how ultimately will this all get sorted out? >> well, in this scenario we have got a billion dollars of insurance for accidental or sudden l...