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Technical condition with two experienced and trained pilots was involved in such a terrible accident. >> reporter: finding the second black box will be critical to unlock the mystery of what brought down the jet. on the flight data recorder investigators will get a second by second break dlthdown of how the systems were functioning. was everything working or was there mechanical failure? the status for this piece of the plane is unclear. france's president said this. >> translator: a second black box is being looked for. its outside frame has been found. unfortunately, not the black box itself...

If in fact the last eight or ten minutes of that cockpit voice recorder has no sound from human beings the pilot or co-pilot or anyone else for that matter, tell our viewers what that means. >> well it certainly fits a scenario where you had some sort of decompression event, wolf. some event where the pilots were overcome by hypoxia, lack of oxygen. we saw this crash, this type of crash a few years ago over greece. the helios air crash, decompression was gradual, the crew eventually lost consciousness and the plane flew on on auto pilot. however, it didn't go -- descend in an erratic way which...

Said there could be an erroneous indication from one piece of the electronic gear in the airplane to another set of computers on the a320 that could make the airplane believe it's about to stall. if it's about to stall, the airbus says i'm not going to let you do that i'm going to push the nose over of the airplane and try and get the nose lower and descend to keep the airplane from stalling. >> you think that potentially could have happened. let me get peter to react to that. what do you think of that theory? >> i think we have to consider anything. i think the most troubling part of this acc...

Families how this plane went down. tonight, investigators are mapping the debris field in the french alps where the aircraft is described as obliterated. recovery teams are struggling to get to the wreckage spread far apart starting in an altitude of about 6,000 feet. their challenge, navigating vertical slopes and deep ravines is enormous. >> they may have little cliff edges that they may have to pick things off of. as they descend, they may have to stop similar to this gather things put them into a bag and keep rappelling down. >> reporter: this high altitude mountaineer has climbed stark pe...

>> one final question before we move on because we have a lot more to discuss. a preliminary check by u.s. law enforcement agencies of the manifest of this plane, they found no criminal links. investigators haven't ruled out anything potentially including criminal activity or terrorism. >> i'm not too sure about the reports that they haven't found any links. i don't think they would tell us if they did find links right now. it's a preliminary investigation. it's very early. they won't tell you one way or the other at this point. >> anything is out there, they have to look at everything obvious...