Flight 370: How the BlueFin-21 Sonar Sub Works

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Published on 14 Apr 2014, 22:41
It takes two hours for the Bluefin-21 underwater vehicle to reach the seabed to search for remnants of Malaysia Airlines Flight 370. Why do authorities think it's now the best hope for finding the missing plane? WSJ's Jason Bellini has #TheShortAnswer.

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