Searchers in the south Indian Ocean are now narrowing in on a series of 'pings', with a fifth signal picked up during search operations yesterday.
What does it take to search for these 'pings'? And what happens after the black box's battery runs out? Is all hope lost? Melisa Idris asks Pete LeHardy, from Phoenix International in Largo, Maryland in the US. Phoenix International is the company that operates and maintains the US Navy’s inventory of underwater search and recovery equipment, including the Towed Pinger Locator and the Bluefin 21.
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