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And we're waiting to see if it's been more successful than the previous seven dives. as you mentioned the planes and ships still searching for surface debris but nothing found after 44 days. hope surely fading there. i can tell you, too, a cyclone or, in north american parlance, a hurricane, not all that far from this search area. that will make the waves much, much higher in the days ahead. the malaysian acting transport minister today asked for prayers this week. they might be needed, jim. >> that bluefin 21 about halfway through that long walk on the ocean floor as it's been described to us...

Or insignificant. how do the audio experts tell the difference. >> i did a simulation of the pinger output to give you an idea of what we're listening for. [ pinging ] >> nice and clear, crisp, sharp and evenly pulsed. >> but underwater with other echos and wild life sea life, man made noises, swishing of water flow and so on and so fort, this is what the ocean sounds like with the pinger sound embedded in it. and the job, of course, is to try to identify and bring out what we're looking for.

Search, of course, there's the ocean surface, so you've got all the garbage we throw in our oceans which definitely throws an obstacles for that search, for that visual search at the surface. and down below that surface there's something called noise pollution. and manmade noise pollution is certainly a factor in all of this, as well as just the natural ambient noises that nature makes. >> manmade noise like what? >> low and mid-frequency sonar, for example, that have been known to enter fointerfere with migrations. beyond that it just creates a huge soup of noise. >> thus, the issue with putt...

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 ...

>> i can't see him. i don't want to go out there. i don't know what's going on. >> you think he's yelling help? >> yes. >> what is your phone number? >> there's gunshots. >> now, the prosecution had some people who were described as audio experts lined up to testify that the voice on the recording was not george zimmerman's but the judge ruled they couldn't take the stand because the science they use, the techniques they used to analyze that basically wasn't sound. that's why her testimony has become important. i interviewed her a month after he was killed. here's what she said about the 911 c...