10 Planes, 9 Ships Scour Search Area in the Indian Ocean

Search crews say they are desperate to find debris from Flight 370 in order to begin the underwater search.
3:00 | 04/01/14

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Transcript for 10 Planes, 9 Ships Scour Search Area in the Indian Ocean
This is a special. Another day combing hundreds of square miles of the Indian Ocean searching for any clue that could lead to the mysterious missing plane. Discouraged. But still determined. -- We really need now is to find debris wreckage from. -- -- -- And that will that would change the whole night sure of that search because world and the -- to employ. High technology. To assist us to. Do the underwater. -- -- the the search. Well what I'm down Cutler -- New York with this ABC news digital special report in the search for Malaysia airlines flight 370. So for the latest on a rain ABC's Marcy Gonzales -- -- And and still hard it's hard to believe it's still no debris from this plane has been found and the man leading the effort says the search could quote. Drag on for quite awhile. Ten planes in nine -- spent another day scouring the search area in the Indian Ocean looking for any Trace of Malaysia airlines flight 370. While on the ground clarification. Of the final words recorded from the cockpit. Malaysia's transport ministry releasing the transcript of the flights last voice transmission. Revealing early the morning of march 8 air traffic control told the Boeing triple seven to climbed to altitude on its path to Beijing. Instead of the pilot or co pilot replying all -- good night as the government initially claimed the final words recorded from the cockpit before the plane disappeared or actually. Good night Malaysian 370. Another discrepancy still unexplained by Malaysian authorities. He seemed like they're very normal air traffic control transcripts. I didn't hear anything -- that was -- the usual investigators now conducting a forensic examination of that final conversation. Trying to determine if it was the pilot or co pilot speaking and if there were any signs of stress or tension in his voice. Today in Kuala Lumpur at the annual meeting of the IATA the trade association for the world airlines a focus on the need to improve tracking of planes in flight. And a moment of silence for the 239. People who were on board flight 370. As the -- with so much still unknown. Continues. This search and recovery. Operation. It's probably the most challenging one -- my -- at the same. And now there is little time left to find the plane's black box -- is expected to run out of battery power with in the week. And investigators say a ship carrying a device to locate the black boxes -- Is still days away from the search area down. ABC's Martha Gonzales with the latest on the search -- thank you for that right now to bring an aviation consultant Tom -- are also for NTSB investigator Tom. Air traffic control transcript from -- said -- were finally released today do they give us a glimpse of what just might. Happened or is it really does seem like a standard exchanged back and forth. That the transfer who selflessly of standard exchange. We'll have to be done as was mentioned before there is listen to voice is that whose voices of -- and also any stress in the voice. That might give us a clue what exchange itself was actually so you're actually -- like voice forensics or some -- -- -- and the sound -- the audible exchange. Well several things you can do one you like listen for background voices sometimes. On -- actual training tape itself. Besides that the -- saying you can hear things -- on the background of the competent back to be helpful. But also under stress you know the -- voice changes and whether that's discernible so the things they can do received anything in that little's. That a tape that might gives a -- -- a little bit deeper into that because we oftentimes see in movies or it shows where they are able to. Sort of pull out various channels of frequencies whether that be a different pitches you had mentioned there. Or different type of tolerant of -- all audible stationed there. If it wasn't like -- -- say siren or alarm going off would they be able to actually pick up the sound public engines but they go to pick up the sound like -- that would be hitting against the the windows. Sometimes -- can -- more difficult when policies and their boom mikes. It's much more focused and don't get so -- the background sounds. But you can occasionally pick up the sound of an engine you can pick up clicker to have something movie in the competent. And even occasionally. Someone speaking in the background. So hopefully it'll lessen -- Sears Tower boom mikes do we know yet if -- -- -- -- my course -- the Mike that they actually have a and a headset. That we don't know right now because obviously. They -- -- either. And it had -- on the tape itself and see with the quality tape does with the background sounds -- right now we don't know I'm assuming a boom Mike that would be available via Morgan on the is setting. If it's like a hand held microphone you'll pick up a lot more errors of the surrounding noises if it's an action had set boom -- -- -- off. That tends to be a lot more focus and you get fewer -- background sounds so look at the actual search itself is that crews are focusing on an area. They say it's about the size of the state of Pennsylvania it's obviously smaller. Them what it was but Austrian officials are admitting that they don't know exactly what the altitude -- they don't know what the -- the plane was so. How was -- that -- able to sort of identified this particular area if they don't know how fast or how high the plane was flying. Well this particular area is based on the -- analysis of the data we currently have. And clearly there assumptions that would into -- analysis -- data is available. But you're actually correct that if you change the assumption slightly in terms of the -- the aircraft was at the speeds -- that. That would changes surgery again. Right now there's going on the best data analysis -- have which frankly is not much that the search operation itself has obviously gotten very complex with a lot of countries coming into this. Trying to get their efforts coordinate planes trying to coordinate some of the rescue -- -- some of the search boats as there as well they've had to call in. -- a true an air traffic controller -- well right to help coordinate these efforts. -- you need to do that -- when you have this many aircraft that area you need to have signed -- need to courted -- activities mean we have a limited -- days here left for those fingers to keep providing. Sound move. The flight data recorder copper -- -- So you really need to focus your activities and that really needs your current controller keep everybody kind of doing the same thing. And again with those black boxes they have about -- five days of battery life left is that with the estimation is right now. What the manufacture guarantees thirty days or down to a five -- range however we've seen them last as much as 45 days. May be -- lucky here one of those -- longer. But. Every day that passes certainly becomes. A problem for vampire hearing those things -- -- seen so much about how these things are made and how there other and clothes and protected basically from any kind of a potential impact. Does water temperature -- the pressure does that have any kind of an impact as far as elect -- -- the manufacture guarantees thirty days but. Could exterior factors. Either shorten that timer or prolong it. Well I mean it's not so much. -- -- The depth there won't bother them too much have we seen cases. Of the year the Rick good device being buried by Iraqi Ager buried themselves -- their four the sound doesn't get out and even those pain away. It's -- so attenuated does and travelers for that's happened before. Also -- there's big changes in water temperature and salinity of the water. You can occasionally have problems was the acoustics of nations more difficulty here. So instead of being able here over 35 miles -- down to maybe a -- what. Are the conditions like for the Indian Ocean for conducting -- kind of a search is sparse in what he said mentioned water temperature and the solidity just how salty is into the water is. What are more favorable conditions. Well it depends obviously the best conditions -- -- Great Lakes we're juror kind of nice even temperature you don't know assault environment. The acoustics their commuter good. Dig into the ocean especially -- you're closer to the surface. With a lot of wave noise to can be a problem that's -- the reasons. This towed device -- -- down deep so it gets down below all the proper noise of the water. And can hopefully here that -- search continues on top -- former NTSB investigator Tom thank you for your time we really appreciate that. Of course you can stay with this story keeping updates downloaded in real time by downloading ABC news apps are in a -- for exclusive updates on ago. For now though I'm down that's where New York with this ABC news digital special report.

This transcript has been automatically generated and may not be 100% accurate.

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