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Trying to find survivors, the ntsb has a different job. tear job is to try to determine what happened, why it happened, and, if necessary, to then instigate changes that would prevent a tragedy like this from ever happening again. at their briefing last night, they pointed out this vessel has on board something very similar to what we have all become very knowledgeable of, like a flight data recorder. only in this case, they call eight voyage data recorder. and that device, apparently, records everything that occurred on board the vessel in the last 12 hours leading up to whatever catastrophic...

Catastrophic event struck it. >> that information would be vital for the ntsb investigation. right now they do not have a lot to go on. but to find it, you pretty much have to find the ship. that's believed to be in very deep water. again like the flight data recorders, there is something called a pinger. the data recorder has one t. batteries have a time frame of 30 days i asked if they have been listening and have they heard anything? the answer so far is. john, christine. >> such a sat story. a everyone with no rain in the forecast nor the carolinas, the situation there still dangerous. i w...

And to prevent another one. while they are here in jacksonville, they have a full team looking at e-mails and radiotransmissions, maintenance records, but their ultimate goal is to find the ship itself and that's difficult. it's believed to be resting at the bottom of the ocean three miles deep, 15,000 feet. they will try to find it with the help of the coast guard and navy. it they do find it, they will try to recover the voyage data recorder. it gives them 12 hours of data on the ship before it capsized. its movement, speed, whether there were hatches open and things like that. a very diffic...

Quickly. good question. miranda asks why don't we have live cam ares on planes to when we detect something wrong we can help the innocent and take over and help? >> the airlines don't want it. i don't know one that shot 149 people at one time. >> that could be live sent to some place. we've got the technology. they have to do it. less a question for you from bob. why is the second black box -- this is for you les -- so hard to find if pinging like it's supposed to? could the pinger be damaged? >> well the pinger is used primarily for underwater situations. in this particular circumstance it wo...

Cal questions. where is the plane and what caused it to vanish? an official report on the disappearance of flight 370 reveals the pinger batteries on one of two black boxes expired long before. >> the family members -- >> reporter: lawyers representing 27 of the victims' families say that may have compromised the search. >> the balancettery pinger expired, it's another dagger in the heart of the families. >> reporter: the airline admits the maintenance oversight but denies it hampered the search because batteries on the other black box worked. the revelation is one detail in a newly released r...