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I think it is fair to say that for many us, all of our lives, space is the final frontier. we have got frontiers right here on earth where no man or machine has ever been before and it just so happens that's exactly where the sonar sub is looking for flight 370678 the search area is so very foreign, the sub couldn't even finish its first dive. >> aborted its mission about the six-hour point. what this vehicle was programminged to do on this mission was maintain an altitude above the sea floor 30 meters while it conducted a side-scan sonar search of the area. now, one condition that cause it is...

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 ...

Maximum operating depth of 4500 meters. that's what happened in this case. the charted depth is between 4200 to 4400 meters in that rectangle that it is searching. we hit a deeper spot that when initially planned. we have to bring it up, reprogram it, shift away from that deeper area and adjust the search pattern. >> the bluefin is being used in the most-likely spot. what makes that the most-likely spot? is there other data that is pointing to that particular location? >> the information that tells us is the nature of the detection from the towed pinger locator we had in that area. it was the ...

Sources close to the operation. they say the bluefin had been calibrated to go to a certain depth. it's not clear why but the vehicle started to move towards a lower depth and at that point it took itself out of the mission. a source close to the operation tells cnn, the bluefin-21 is back in the water, searching for possible debris in the same place it was looking monday night. the source says the underwater drone is operating at about the same depth as its first mission, even though in that first operation it overextended. >> the one condition that causes it to abort its dive is if it reache...

Points they take that make sense if you look to control of a border area. >> nick patton wash. that's it for us. see you at 11:00. good evening from boston. i am bill weir. we begin with breaking news on the never ending hunt for flight 370. navy's underwater search vehicle aborted its mission. it exceeded its operating depth of just under three miles deep. a built in safety feature returned it to the surface after six hours of data gathering. technicians looking at that data hoping against hope it might present some trace of the plane after a disappointing first search day. revelations abou...