(NEWSER) – When an Australian ship heard pings possibly from Malaysia Airlines Flight 370, officials saw a big lead open up in the search—but since then, investigators haven't been able to recapture the signal, Reuters reports. That's particularly worrying since the batteries on the jet's black boxes have likely just about run out. But "we need to continue (searching) for several days right up to the point at which there's absolutely no doubt that the batteries will have expired," says Angus Houston, the Australian official leading the search, per CBS News.

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