boxes may explain what led to this disaster. but how will searchers look for the plane under water? first, they will likely listen for it. all commercial airplanes are required to carry pingers, underwater locater beacons attached to the black boxes. they emit a ping once a second. >> it's really simplified an under water microphone. this is the type of device they'll tow behind the vessel and listen for that pinger locater. >> how far can it hear? >> about five miles. >> unlike the extreme depths of nearly three miles in the indian ocean where flight 370 disappeared, the java only runs 80 to 100 feet deep. while it's easier to operate the hydro phones at this depth, he
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