CNN Anderson Cooper 360 March 26, 2014 00:52:00
>> 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 recording about six minutes before the aircraft actually hit the water. >> reporter: leaving investigators to wonder why they suddenly lost control of the plane. it was a fire, they later found, in the jet's entertainment system which also caused ...