Malaysia search shifting from surface to ocean floor: "The autonomous Bluefin-21, which is leased by the U.S. Navy, is in its 16th day of searching the ocean floor with sonar. Technicians program the sub and then retrieve it to download data and look for echoes from man-made objects rather than rocks on the ocean floor.
But the Bluefin-21 moves at about walking speed. So far it has searched 155 square miles and Abbott said the primary underwater search zone is 21,622 square miles, which is expected to take months longer even with additional search equipment."
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