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Salinity, temperature, and if sound is coming up here, and it hits this layer. because this is slower, it could essentially bend that sound and make it go to a different angle than it was a moment ago, and then it may come out where you don't expect it at all. also, in some cases, it may come up, hit the layer and start ping-ponging between the top and the bottom of it. and by some theories, particularly with lower sounds, it may go many, many, many miles before it comes out. this may explain why a pinger that shouldn't be heard more than three miles away is being located in a range of some 17...

First of all, to get to it from the cabin area. you'd have to take them -- they're in the back of aircraft. they'd have to be taken out, brought forward. the best way take it out of the aircraft would to take it to the equipment bay and drop it overboard through the outflow valve, which is in the bottom of the bay. that would be about the only way you could do it. again, it would be extremely difficult if not impossible to get it from the tail of the aircraft into the interior of the aircraft. >> professor stupples, i wonder about your level of optimism. we were hearing a lot of it from air ch...

Urgency now. the batteries on the plane's black boxes due to run out and just days after expressing optimism about the missing jet, australia's prime minister now saying that the search could go on for a long time. dominic dinatale joins us live from l.a. with more. >> reporter: hey there. yes, it's been a process of elimination really in working out what these signals could be. was it a submarine that shouldn't have been in the area? prime minister of australia has been saying that he feels deeply, confident that indeed what the ocean shield has been picking up with the pinger that is being -...

Be able to find it because it's in something like that. i have to tell you, phoenix international, the group out there appropriating, superb at this thing. finding that pinger. if they need to, penetrate inside an aircraft and remove the black box. they're the best on the planet to do that. >> yeah. how much time do i have producers? i wanted to ask something else. i can ask in the next segment if i can't. okay. i want to ask. a great point from one of my senior producers in the booth is that we have been looking now, the last time we heard about any debris, especially david, was, what, a week...

It is called a pinger locator. this has to be within about a kilometer or some of where the pinger would be. and what it does is it gives you a target strength and a bearing. you put this on an underwater vehicle and you can get a target strength and bearing so that vehicle could then find its way along the sea bed to wherever that pinger is located. >> but this is the part that confuses me. if that device needs to be within a kilometer, how can these four different locations, 17 miles apart from one another all be accurate unless that is a reflection of sound bouncing around within the ocean....