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The black boxes are found, who gets them? cnn senior correspondent joe johns has more on that from kuala lumpur. >> reporter: over two dozen countries have been involved in the search for the missing plane. any hope of unraveling the mystery in the fate of its 239 passengers and crew rest in two boxes. the flight and data recorders. >> we have very much narrowed down the search area and we are very confident that the signals that we are detecting are from the black box on mh-370. >> reporter: if they find them, the question remains, who gets the black boxes and who will lead the investigation ...

Of the crash, memory hips extracted from the data recorders could still be damaged and might require cleaning until the raw data begins to paint a picture of what happened. >> we still don't know what condition they're in. and they've been sitting on bottom of the ocean under extreme pressure for, you know, weeks, perhaps months by the time we get them up. the water could have caused some deterioration of the circuitry. you just need to be careful when you first download it. if you screw it up, you may lose vital data. >> reporter: and time is now a vicious enemy. >> the batteries are starting...

It's a bit late in the day for the left hand not to know what the right hand is up to. this far down the road they should be speaking. >> how do we know what to believe? and -- >> i think it is inevitable that there will be some discrepancies in fact. but something as fundamental as this, whether or not they have cleared everybody or not is a little bit basic and those sort of things we shouldn't be hearing about now. if one party is not sure you say i don't know. i don't know. >> let's talk about the data recorders when or if they are retrieved from the bottom of the ocean, is it feasible tha...

Data recorders from the crash off brazil, the recorders were found about two years after the crash, long after the pingers had died. underwater vehicles were used to also recover artifacts from the titanic, but before sending the investigators down they have to map the terrain. a step that takes time and requires patience. >> if it is in rocky or cavernous terrain, it can be challenging. but once the wreckage is identified these vehicles and operators have extraordinary capabilities. >> locating them is one thing, but pulling the black boxes from the incredible depth is another thing, the remo...

Happens once they're finally recovered? our senior correspondent joe johns is joining us from kuala lumpur right now. he's got more. what are you hearing about the fate of that black box or both black boxes once they're discovered, joe? >> reporter: well, wolf, retrieving information from the black boxes can be a tough job, and for days now, the question has been who's going to do it? now we're learning the malaysian government is not planning to try to do all of the work by itself. over two dozen countries have been involved in the search for the missing plane. any hope of unraveling the myst...