daunting. rosa flores joins me now. rosa, what did the researchers think about the pings found so far? do they think that it is consistent with the national ocean sounds or the mh370 pinger? you know, don, i talked to ocean gra f oceanographers in several states around the country. they say the first pings that we heard from the chinese, those were probably sea life, they say. and they say that because of the duration of those pings. these latest pings that we ve been talking about, these four pings that have long durations, all of the oceanographers say that s very credible, that s very consistent because of the length of those pings. don? rosa flores, thank you very much. fabien cousteau is sitting here nodding his head. when we talking about the white noise complicating the
reporter: we drop an underwater microphone, a hydrophone off the back of the boat as it moves farther away from a pinger that s already been submerged. and even less than 100 yards away, the ping starts to fade. distance isn t the only problem out in the indian ocean. there are other noiszs competing with the sound of the pinger like sea life. one dolphin species sounds like a black box pinger. and this the sound of rain under water. let me get away from the loudest part of the boat so i can show you one of the biggest obstacles that searchers in the v. in the open sea, just ship noise, even here listen to how loud it is. they re at a minimum 15,000 ships on the world s oceans on any given day. creating even more obstacles in a search that s already
i m joined again by awudio expet paul gensburg. some might sound blurry or insignificant. show us the audio experts how they tell the difference. okay. what i ve done is prepared a simulation for you. first i have a pure tone as if it was coming from a pinger. and we can play that. nice and clean. right? but, once we submerge it down three miles and we start to listen from the surface, we re going to hear it embedded in ocean noise. you can barely hear it. that s right. and if you don t know what you re listening for or if you re not in range you won t hear it. can we put that one up again? let s put that one up again, paul. this is what it sounds like and you re wondering about the sound
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the important part is in the preplanning and that s what they were trying to get together in the initial stages of looking for these pings. no doubt. looking, the example that s been shown than extraordinary. and we re all getting some very interesting lessons in oceanographers and acoustic sounds. what we re seeing at the moment in this very small search area, not the large one but the very confined one, we re seeing the ocean shield go through with the pinger towed pinger locator. it does a sweep through and then exit the search area and then hms echo comes in behind it and it s doing methodical echo sounding search on the bottom as well. i think they re putting a lot of hope in the fact that first of all, getting some more pings, obviously. but that hope is fading fast. they re also hope that echo will pick up something on the bottom or if nothing else, eliminate an area where there