Hunt to track down MH370 black boxes

Searchers face a huge challenge locating the Boeing 777's "black box", which holds vital clues to determining what caused the plane to vanish after it took off from Kuala Lumpur en route to Beijing on March 8. But experts believe the flight data recorder and cockpit voice recorder may not yield answers to the riddle of how and why the plane diverted an hour into the flight and embarked on a baffling journey to the southern reaches of the Indian Ocean.VIDEOGRAPHIC