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Of the missing malaysian flight. the submarine was unable to complete the first mission, because it has reached maximum operating depth, and it came back to surface and downloaded six hours of data, and found nothing. but they plan to the launch it again. and parents and students are walking through the pennsylvania school that was the scene of mass stabbing that injured 22 people, and classes won't continue until tomorrow at franklin regional school, and students and parents were able to walk down the hallways and in preparation to cope. >> and some is say that michael jackson jackson's mom...

The bluefin 21 and the flight for flight 370. the bluefin reached its depth then automatically turned back when it hit about 2.7 miles down into the ocean. apparently the ocean charts were wrong on land. so explain to us what that means. >> well, a couple of things. first of all, we should know that the bluefin functioned the tway should operate. all auvs have a maximum operating depth. if they doubelow that they risk collapsing in on themselves. for safe operations they picked that depth as a design criteria. so the issue in the ocean is that the bathinatry is not well understood. the best yo...

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...

The roughest seas in the planet at any given moment if a storm comes along. a big and complicated job, pamela. >> so i want to go to david kelly now. curious, this is clearly a very -- really, one of our last options of trying to find the wreckage in this area where the pings were detected. why are we just using one blue fin? why not more than that? >> well, pamela, thankfully these events are fairy rare and the equipment we built is used every day around the globe, so there aren't a lot of these vehicles sitting by idly. >> and the bluefin is working at the very limits of its capabilities alm...

Here on land. just wondering about the operating depth of the bluefin and how comfortable you are in the water and depth that appears to be underneath the ship right now in the survey area? >> yeah, so as you know, the pings we think are at about 4500, to 5,000 meters down. so pretty deep. also it is a silt bottom. so environmentals are okay right now. the side scan sonar does have enough power to penetrate through the silt a little bit of a layer there. so this is a pretty powerful sonar and camera system we have. you know, i -- it is tough to say with the environmental sound certainly at tha...