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Inspection of the door that locks the cockpit because if, in fact, somebody was trying to break into the cockpit, there would be evidence easily observable on the door itself. >> reporter: the cockpit voice recorder could be revealing but it records over itself every two hours. the critical piece about 40 minutes into the flight. >> you don't get the bits where it first changed course, and that's what we really want. so we don't know who changed course. we don't know who was in control that particular moment. >> reporter: the condition of the airframe, the seams holding it together, could prov...

You mentioned found on the shores of western australia. still waiting to hear from investigators whether it's from the plane or just more ocean trash that we've had before. >> reporter: more than 1,000 miles from where crews are searching for flight 370, debris from something containing sheet metal with rivets and fiberglass coating washingtoned ashore in australia. authorities are investigating but skeptical it's from the plane. >> 777 is a complex system. boeing knows their plane very well. it will be easy to identify whether it's from the air frame at the end of the day. >> reporter: the su...

Locks the cockpit, because if in fact somebody was trying to break into the cockpit, there would be evidence easily observable on the door itself. >> reporter: the cockpit voice recorder could be revealing, but it records over itself ever two hours. the critical piece about 40 minutes into the flight. it won't be there. >> you don't get the bits where it first changed course. and that's what we really want. so we don't know who changed course. we don't know who was in control at this particular moment. >> reporter: the condition of the air frame, the seams holding it together could provide clu...

Whether it's from that air frame at the end of the day. >> investigators are looking at it now. we should know soon and that's a good thing. david, malaysia says it finished its preliminary hearing report on the disappearance of flight 370. but authorities say they will not make it public. why? >> that's a really good question. the preliminary report is a requirement and as i understand that preliminary report and as i understand annex 13, the responsibility is malaysian airlines to provide survivors of an accident what they think it is at that point so why it's not being made public, i have a...

Could pass over wreckage and miss it? >> it's unlikely. the bottom has a soft layer on it. it's not that deep. these are large pieces of wreckage, you would assume large pieces of wreckage coming from an air frame as big as the 777. chances of something that size being missed is very, very slim. the image quality coming out of this type of sonar that's on the bluefin is quite good for large objects like this. >> you think about other situations where a similar device was deployed. air france, for example, it took four extensive underwater searches. i believe it was nine days into the fourth se...