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Data recording, the container of the box has been found but not the contents inside. we listened to the briefing by the investigators and he claimed no second box was found at all. some confusion on that. back to you guys. >> still a lot of questions, remain, greg. thank you. >> so what can we learn about what caused the accident from the cockpit voice recorder or the jet's final moments in the air. we are john -- joined by bruce. i am astounded of the time line. 10:30 the plane was at altitude and told to stay there and started a descent at 10:31. the pilot spoke at 10:30 and 10:31 when air t...

The know how to go through the information contained in those black boxes or should they hand them over to an organization that knows what they're doing and have more experience? >> there are only four or five independent safety boards that have capability to download the data. the dangerous part in data recording retrieval is the initial download. if you don't do that right, you could lose data. they should turn it over to the ntsb. they can turn it over to the british, the french or australians. the ntsb is there. it was a u.s. manufactured plane. we should do the . >> let's go back and, i w...

Sure that it gets in the right hands to have it analyzed and not in any way attempt to download or distort data. >> can a black box, quickly, can it be compromised easily? >> oh, yes. if you don't open it and do the download correctly you could destroy or harm the data. and then of course once the data is downloaded, usually what you work off of is a printout. you print out these parameters and it looks like -- almost like an ekg. it's like an ekg for the plane and you have long running tallies and lists of data, numbers really. from the different things that it records on the plane. if you wa...

Doctors and others now caring for these kids, we all thank you. it's just another example of the great medical service in this country. thank you. >> yeah, thank you. >> and we have a hopeful sign today in the long search for the missing malaysian airliner, an australian plane detected another ping today that could be -- could be coming from mh 370. four other acoustic signals have been detected since saturday. those are said to be consistent with sounds coming from a plane's data recording. search teams are in a race against the clock to locate the wreckage before the black box batteries wear...

Explain what they are. >> these are the black boxes. we get a lot of questions about black boxes. what are they, where did they come from, why. in the 1960s is kind of when this started. even earlier than that. but australia had bad accidents. this is an investigation tool to recreate or go back to what we had before. i'm going to take this apart a little bit so we can see inside some of the fascinating technology for me. i'm kind of a technogeek. if you look inside of this, i don't know if we can see that well, but this particular one was used in the 60s and up until the 70s. >> would this ha...