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But it's worth saying that the "hms echo" has sophisticated sound-detecting equipment, but it's also capable of mapping the sea floor. officials here in australia are not commenting on this development in the search at the moment, but not saying whether or not this might signal perhaps a new stage of this search. for all we know, as you say, the "ocean shield" is currently out there, equipped with that american towed pinger locator, scouring the waters, trying to detect more signals from this black box pinger. and angus houston, who's the man, the chief coordinator behind this multinational se...

If you go all the way down to the deep ocean where this pinger is, what we're talking about is the deep area at the end of the long slope that they're dealing with in this area. it is more than three miles deep. over here, more than one and a half miles. this is generally believed to be around the two and a half mile deep zone. that is plenty deep for all the equipment we have that might reach it. if you go below that you're relying almost entirely on robots. and placement along the ridge, jake, makes a big, big difference. if they can keep it here, that is easier, if they find it upslope, tha...

It's something that was made by man, and i really have no idea what it would be other than an acoustic beacon. >> reporter: searchers who are towing that pinger locator behind the australian ship "the ocean shield" have detected it four times -- first two on saturday. as time has passed, they are noticing that the signals picked up tuesday are not as strong as who they heard on saturday. >> that means probably we're either a long way away from it, or in my view, more likely, the batteries are starting to fade, and the consequence is the signal becoming weaker. >> reporter: two dozen airplanes ...

Understanding is because of the way sound can refract under water, that is why you're getting these locations. >> when you look at the graphic, i think you can see where the ship was or the pinker was -- pinger was, it doesn't mean that is where the plane was -- >> why is it spread out? because sound bounces around on the water? >> exactly, sound bounces around, and depending on where the tpl is, the sound, it depends on where they go, with the layers and the topography. >> that is why they're getting the opportunity to hear more pings -- >> it would be like standing up on the mountains in the...

Ocean shield is towing this pinger locater searching for flight night. my experts are back to answer your questions for you. this tweet is for david. it says will the extreme cold of the deep ocean help pinger batteries last longer? any mathematical estimates from your experts? >> i don't think it will. it is supposed to go 30 days. it has a buffer but that includes the testing at cold, hot, whatever temperatures, but not hot hot temperatures, of course. but normal operating temperatures. the cold temperatures don't extend it. >> we have this the e-mail from pat sutton. she said earlier today,...