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(CNN) – Searchers are racing to re-discover signals which could be from the pingers on Missing Malaysia Airlines Flight 370's black box recorders.
The frantic search to pick up those signals again has been going round the clock, because the pinger batteries are running out, if they're not dead already.
"As optimistic as we were, to even get any detection, really, is pretty miraculous," said Commander William Marks, spokesman for the Navy's 7th fleet, which is overseeing the U.S. role in the search.
"Without any leads this area would simply be an incredibly huge area to try to search," said Marks.