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Breaking news in the search for malaysia flight 370. the bluefin-21 underwater drone we can confirm has now completed its first full underwater search mission. that is significant and all in, we are just finding out it has searched approximately 35 square miles in total. the air search today continuing. they're searching another 16,000 miles by air. and they say they are planning for the bluefin's next mission. what it saw underwater, we're waiting for the analysis of whether it saw the plane. two earlier missions were cut short due to technical problems. this is the first time they've had all...

>> you use three to find the wreckage. tell me why they're just using one blue fin here? >> they are only using one because that's all that they have available. you wonder if more authorities had exerted more preshire. it's not that there is one or two kinds of auvs, there are all sorts of kinds i do know that the smash operating just under the limit that it is designed to do. it would be easy for this other auv to do this kind of work where the blue fin is really almost not appropriate for this job. >> there is one school of thought. maybe this is the more

Its job, not to listen for pings but to map the ocean floor and look for debris. to do that, it can use two different payloads, which have to be swapped out. >> this particular payload section is the acoustic section. >> reporter: first the bluefin uses side scan sonar and a multibeam echo sounders that bounce sound waves off the ocean floor that aren't natural. if picked up, the bluefin can be brought to the surface. the sonar technology is taken out and high-tech cameras are put in. >> it's a high definition black and white camera capable of three frames per second. >> reporter: together the...

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,...

Mountainous terrain and complete darkness. but even diving blind there is much hope that the bluefin-21 auv will see something. randy kaye, cnn, quincy, massachusetts. >> amazing technology. you follow me on twitter tonight. coming up next we'll look more at the cell phone transmission from flight 370's flight deck. reports about that and what it could mean. we'll be right back. t they're g, get married, have a couple of kids, [ children laughing ] move to the country, and live a long, happy life together where they almost never fight about money. [ dog barks ] because right after they get mar...