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A submarine built by Bluefin Robotics is lowered into the water by systems engineer Cheryl Mierzwa in Quincy, Mass., Wednesday, April 9, 2014. Bluefin Robotics shipped a version of their submarine to help locate the missing Malaysian Airlines Flight 370, by using its side-scan sonar. (AP Photo/Scott Eisen)
A submarine built by Bluefin Robotics is lowered into the water by systems engineer Cheryl Mierzwa in Quincy, Mass., Wednesday, April 9, 2014. Bluefin Robotics shipped a version of their submarine to help locate the missing Malaysian Airlines Flight 370, by using its side-scan sonar. (AP Photo/Scott Eisen)

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Bluefin-21 'slower than you can walk'

Analyst David Gallo helps explain the current process of searching for MH370 with the underwater vehicle, Bluefin-21.

Bluefin-21 'slower than you can walk'

Analyst David Gallo helps explain the current process of searching for MH370 with the underwater vehicle, Bluefin-21.