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AT SEA - APRIL 1: In this handout image provided by the U.S. Navy, The Bluefin 21, Artemis autonomous underwater vehicle (AUV) is hoisted back on board the Australian Defence Vessel Ocean Shield after successful buoyancy testing April 1, 2014 in the Indian Ocean. Joint Task Force 658 is currently supporting Operation Southern Indian Ocean, searching for the missing Malaysia Airlines flight MH370. The airliner disappeared on March 8 with 239 passengers and crew on board and is suspected to have crashed into the southern Indian Ocean. (Photo by Mass Communication Specialist 1st Class Peter D. Blair/U.S. Navy via Getty Images)
AT SEA - APRIL 1: In this handout image provided by the U.S. Navy, The Bluefin 21, Artemis autonomous underwater vehicle (AUV) is hoisted back on board the Australian Defence Vessel Ocean Shield after successful buoyancy testing April 1, 2014 in the Indian Ocean. Joint Task Force 658 is currently supporting Operation Southern Indian Ocean, searching for the missing Malaysia Airlines flight MH370. The airliner disappeared on March 8 with 239 passengers and crew on board and is suspected to have crashed into the southern Indian Ocean. (Photo by Mass Communication Specialist 1st Class Peter D. Blair/U.S. Navy via Getty Images)

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Soaring cost in search for Flight 370

Undersea search could cost a quarter billion dollars, official says. CNN's Nic Robertson reports.

Soaring cost in search for Flight 370

Undersea search could cost a quarter billion dollars, official says. CNN's Nic Robertson reports.