Searchers looking for missing Malaysia Airlines Flight 370 detected another possible underwater ping that could be coming from the plane's black boxes. That makes five signals detected since Sunday.
They're narrowing the search area based on the new information.
Still, the pings are spread out over many miles, and they may be as deep as 15,000 feet.
The Australian official in charge of the search says he's hopeful that crews are closing in on the "final resting place" of the vanished jet.
But searchers won't say they have found flight 370 until they actually see wreckage.