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Crews picked up under water sounds. but they haven't heard any pings since tuesday. the editor of military.com. i thank you so much for joining us, sir. how would you describe the new technology? >> it is an unmanned underwater subas you said. it will take over where that towedpinger and found a ping and it was six days ago. we think it is the black boxes have run out of the batteries and map the sea floor in the area where the pings were heard. >> the understanding that the area which they are looking is several miles deep. how deep can the submarine go? >> like you said in the lead in to the...

I'm optimistic that we will find the aircraft or what is left of the aircraft. in the not too distant future. >> now this marks the fourth time the signals have been detected. the first two over the weekend. the u.s. navy captain in charge of the pinger locator on that australian ship agrees a lot more methodical painstaking searching needs to be done but at least now they are narrowing in. >> i say we are more confident that we found the haystack. >> the next step is to let down the blue fz fin-21 to map the sea floor for wreckage. the area is so big, if you drew a circle around it, it might ...

Further signals. they're trying to get as much information as possible until they're absolutely certain that battery has completely run out. only then they say will they deploy the blue fin 21, the american provided underwater aton mouse vehicle to go down and try to look for any potential wreckage. but certainly, they are more confident about this location as being the most likely place where they'll find some wreckage. >> as you pointed out, the signal is getting weaker, and that's understandable given 33 days now. and of course the batteries were only expected to last 30, give or take a few...

Actually say we're closing in on not just the pinger but the wreckage. >> from what i understand, the ocean floor itself can make this a difficult search as well. can you explain that? >> well, this area is 15,000 feet, about 4500 meters. that's actually the limitations that the blue fin 21 has. they're hoping that this is going to be within this range so they can map the bottom using auv. we have's got mountain ouster rain, we'll have bridges, valleys, gullies and we don't know where this would be in this radius. >> it doesn't sound like unless the pingers have lasted longer than they're supp...