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Malaysia Airlines black box assumed dead

Julianne Cassidy

A family member cries as she and other relatives pray during a candlelight vigil for passengers onboard the missing Malaysia Airlines Flight MH370 in Beijing Photo: Image by Thomas White Reuters

Malaysia Airlines black box assumed dead

By Julianne Cassidy. CREATED Apr 13, 2014

The pings have officially gone silent. The Boeing 777's black box of the missing Malaysia Airlines Flight 370 may be dead.

Four pings were consecutively heard last week, as the extensive search was finally narrowed down to a 500-square-mile area of the Indian Ocean.

"A Bluefin 21 submersible will be deployed to scour the sea floor only when officials are certain no more electronic signals will come," reports Time. "The submersible, which takes six times longer to cover the same distance as the Ocean Shield’s ping locator, will require between six weeks to two months to search the underwater zone."

A typical black box battery lasts 30 days. MH370 vanished on March 8.