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Ago that the auv, the autonomous underwater vehicle, was back in the water. we're trying to get clarification what that means. is it back towards the same depth it was yesterday, is it closer to the surface? we're not sure. we're trying to get some clarified information on that. the mission was aborted automatically by the bluefin itself yesterday. aborted because it started to go deeper than it was programmed to go. according to officials with the u.s. navy and phoenix international, the company which owns and operates this bluefin, it was programmed to go between 4,200 and 4,400 meters down,...

Joining me now is paul ginsburg, les abend and brian todd on the phone. i want to get to you about the bluefin-21. you have visited the folks who are in charge of that technology and what do they tell you about searching the ocean floor with this particular apparatus? >> they bought it from the company bluefin which made it and what they've told us about this is that it has a lot of high-tech capability, it's multidimensional, it can go down to the depth of the ocean floor in that area, about 14,700-plus feet down. it can make it down to that depth. it does side scan sonar and also can take hi...

Them. >> reporter: in this mission the sonobouys and orion planes deployed will detect sounds of black box pings. sonar operators on board the aircraft are manning xurcompute to receive and analyze the signals. they are dropped in a >> the beauty of these things, sonar buoys, they stay out a long time. up to eight hours. >> reporter: then expire and sink to the bottom. they can go around 1,000 feet down. how do they detect signals? possibly from black boxes which could be as far down at 14,700-plus feet. experts say the sound 34506move through the water and with good weather signals are easier...

Traffic controllers. search crews discover a possible new signal on the flight's black boxes which could explain exactly what happened. that brings the number of sounds from the ocean to five. these new sounds were detected by sonar buoys. searchers still have to deal with the massively deep ocean and sometimes unstable ocean floor. cnn's brian todd live in washington with that part of the story. good morning. >> reporter: good morning, carol. the ocean depths are very intimidating. the titanic was down about 12,500 feet below the surface of the ocean. it took search teams more than seven deca...

14,700 feet. so the region we're detecting the signal from is between 13,000 and 14,700 feet. so it's really in the bottom regions of anything ever found that was quite significant by people. so this is going begin an undertaking here that a lot of work has already been put into, guys. >> what impact do you think the weather will have on the operations there with the pinger locator? they could still find the signal, despite the weather pattern? >> yeah, the storm could churn up the ocean a little bit. so any motion with that will make it a little more challenging with any signal left in place ...