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That we're down to five now, although the sounds are getting weaker and weaker? >> they're getting weaker and weaker. but that is exactly what you would expect from the battery in its last days as it gets weaker and weaker. the signal, the output of the transmitter gets weaker and weaker. so it's behaving exactly like you would expect the pinger to do. the fact that you have five of them after a while, it walks like a duck and quacks like a duck, it's a duck. >> what do you make about this report that the plane now -- this difference in altitude, 35,000 feet to possibly 4,000 feet. you know ho...

In different places. at that time he seemed to suggest they were coming from the two separate black boxes. >> absolutely. you know, if it is only from the flight data recorder, remember the cockpit voice recorder has a two-hour loop on it. you're going to get a lot of information from the flight data recorder, particularly if there was no real conversation going on going on in the cockpit. >> this is the flight data recorder, peter, as you well know. this is the little pinger over here that sends out those critically important pings, those signals thalts would help to try to find this. and the...

Looking for any debris that they can find. they need corroboration. they have the circumstantial evidence of the satellite pings and the ping noise. but they need corroborate bing evidence. >> two things going on here, the planes are looking for debris on the map. and then the pinger in the ocean shield is still trawling up and down for five or ten days until they're absolutely certain the batteries are dead. but the planes are in the air looking for the corroborative evidence that it exists. >> and miles, when we look at the map, it is kind of a confusing map, all the gray areas, the search a...

That there's a lot of silt down there. that could complicate the search because the silt on the bottom of the ocean can be very thick and things disappear in to it and it makes a visual search underwater very difficult. >> on monday, you thought there was possibly two pingers. to you think you are dealing with two or one device at this point? >> well, we have the evidence. the assessment was made that we thought there might be two pingers there. this has not been confirmed in further detections that we picked up. now, whether that's because, you know one ping er has run out of battery life and...

Of this journey is certainly going to be the hardest. that's how deep, give or take, the ocean is where those pings are being picked up. and tracing them back takes a whole lot of know-how and probably a pretty serious amount of luck as well. i'm joined now by cnn's meteorologist chad myers in atlanta and from boston the vp and general manager of the company that makes and designs undersea communications gear, including the pingers and also the pinger detectors. chad, i want to start with you. will ripley was telling us about what we have. we have four hit zones but they're 17 miles apart and ...