CNN Anderson Cooper 360 March 26, 2014 03:51:00
Hopefully it will give investigators some clues as to what happened. the voice data recorder could be key to solving the mystery. even if those black boxes are found they may not answer all the questions. randi kaye looks at some past examples. >> reporter: this is the sound of a pilot in trouble. that was the pilot of swissair flight 111 talking to air traffic control just minutes before he crashed into the atlantic ocean in 1998. everyone on board was killed. when crash investigators found the plane's black boxes at the bottom of the ocean, they were stunned. >> both the recorders stopped re...