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He actually said, yeah, paula, this is a good way to characterize this. obviously that doesn't come with a great sense of confidence, but all they're working with are those last pings from the flight and they're very blunt about they have no clue. this is the first time where that's happened where they have no clue in that search zone where that plane could have gone down. right now they're doing the best they can. frustrating situation all around. this search though, kyra, has entered a new phase and what commander matthews is looking for now is a little bit of luck. >> yeah. paula newton, th...

Navy commander mark matthews saying what he's up against. >> we certainly have our challenges in front of us. what we are trying to find an acoustic admission from one of the pingers on the flight data recorder. typically the batteries last for 30 days, usually they last a little bit longer and that's what we're trying to find. what is critical is that the teams out there searching for the surface debris, they get good position data on that and feed it back to the oceanographers to help us determine a probable point of impact from where the aircraft went in. >> and it's so crucial that that is...