New Zealand Air Force looking for debris from missing Malaysian Airlines flight MH370 in April 2014.
Richard Polden—Getty Images
By NBC News
May 20, 2015

Investigators hunting for missing Malaysia Airlines Flight 370 have widened their ocean floor search to a larger zone and don’t know where else to focus if the jet can’t be found there, authorities announced Wednesday.

The underwater operation has been “modified” and experts have started searching a larger area of the southern Indian Ocean even before a survey of the original zone has been completed.

Until now, the hunt for Malaysia Airlines Boeing 777 had been focused on a 23,000-square mile patch where investigators said it probably crashed.

The expanded zone covers 46,000 square miles — an area about the size of Pennsylvania…

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