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surface. it has switches that start activating different deployments. there is dear in there packed in nicely. some of it floats to the surface there is a radio antenna that talks to the aircraft. and then the microphone, hydr are ophone is lit stening to a signal. they sent a cargo plane to indiana in recent days to deploy a cargo plane. anti-submarine mwarfare this is one of the tools that the navy has to look for and track the submarine. they need to find them and track them. on this mission, the buoys have been modified to detect sound in the range of black box
week. you re live in the cnn newsroo newsroom. good morning. i m carol costello. thanks for joining me. day 35. the search area shrinks, but a sobering reality settles in. it may not shrink anymore. five weeks and the batteries on the flight s so-called black boxes are dead or dieing. still this morning s upbeat assessment is encouraging. we have very much narrowed down the search area and we are very confident that the signals that we are detecting are from the black box on mh370. we re now getting to the stage where the signal from what we are very confident is the black box is starting to fade and we are hoping to get as much
information as we can before the signal finally expires. cnn s matthew chance is at the heart of the search in perth, australia. good morning, matthew. reporter: good morning, carol. that s right. the search is continuing. remember it s a 24-hour search now. even though darkness has fallen here in perth and in the area a thousand miles off the coast of perth, as the search operation is continuing, we re trying to determine more pings off the water. optimism was briefly raised despite the fact there s been no breakthrough reported by the mission, the search organizers in western australia. optimism briefly raised by comments by prime minister tony abbott. he s on an official tour of china where the majority of the victims of the missing airliner came from. he went a little further than any other australian official had gone by basically saying
probably what happened there was the frequency or signal characteristics didn t look like the simple aviation pinger. i wouldn t want to judge them. but think about what they are built for. they are built to detect submarines which are running quietly. they are 1,000 feet and well be low the noise that is coming from the surface of the ocean. they are very, very sensitive. it is probably discounting that detection. in spite of what you have just said. will they deploy those fairly soon? they haven t had a tpl signal in four days now.