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(CNN) – It's the start of another search day in Australia, were as many as 14 planes will take off looking for Malaysia Airlines Flight 370.
For the ships involved, it's a round-the-clock process. Two ships detected signals that could be the pings from the plane's black boxes – although over 300 miles apart, and just as the batteries for the flight data and cockpit voice recorders were expected to run out.
It's almost too good to be true.
Those ships have split Tuesday's search area, looking for confirmation that the signals picked up were what they are looking for.
Could this be a step towards some finality for the families, or just another false alarm?
CNN's Tom Foreman reports.