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And they have the possibility of both unmanned submersibles and manned submersibles. the chinese have one that they have already said in news reports that they want to send down. i forget the chinese name but it's translated sea dragon and that holds the record for under water dives, it can go down 4.5 miles. >> is there other technology? are they doing the right thing from an investigation and crash stand point? >> we don't know everything that they know. when air france 447 was found, there was three autonomous under water vehicles that were used in a search pattern. so clearly we're not doi...

The water. you have some rcommunication between that and the ship. you can command it to start a certain search pattern. >> your seeing things in real-time from the vehicle or is that just data you get once it comes back up? >> so once you recover the vehicle you go through this four hour process where you replace the battery, you reprogram it and download the data you collected on the previous mission. you take two to four hours to go through that data to see what the vehicle observed. so there's no live data link transmitting the information giving real-time feedback. >> do you have a sense ...

Search was cut short. just six hours into its mission the bluefin-21 surfaced. 14 hours early. the bluefin was originally expected to scour the ocean floor for debris. the whole journey lasting 20 hours. but instead, the device resurfaced after the o official say it exceeded the operating depth of 14800 feet. >> we just hit a deeper spot than we initially planned so we just got to bring it up, reprogram it, shift a little bit away from the deeper area. and adjust our search pattern. meanwhile, a new detail emerging. a u.s. official tells cnn the co-pilot's cellphone was on during the flight ...

It was expected to scour the ocean floor for deb british the whole journey lasting 20 hours but instead, the device resurfaced after officials say it exceeded its maximum operating depth of 14,800 feed feet. >> we just hit a deeper spot than we initially planned, just bring it up, reprogram it, shift a little bit away from that deeper area and adjust our search pattern. >> meanwhile, a new detail emerging, a u.s. official tells cnn the co-pilot's cell phone was on during the play and made contact with the malaysian cell tower. according to information shared by investigators. that cell phone s...

Yes or no whether it's related to mh-370. >> now to jeff wise here in new york. you know that bluefin it had to come up before it finished the job because it exceeded its depth. are searchers relying too heavily on technology in this part of the search, jeff? >> you know, when they used a similar technology to find air france 447. and at that time they had three of these devices working a search pattern together. it's not entirely clear to me why there are not more such submersibles available. it would seem this would be a fairly high priority task for them a be set upon. you know, hopefully i...