down killing everyone on board. >> forced us to come to the conclusion that the flight was deliberately crashed. >> reporter: the cockpit voice recorder capturing it all. investigators say as the plane hits cruising altitude, the captain asks lubitz to take control, stepping out of the cockpit presumably to use the restroom. the 27-year-old co-pilot switches the plane into autopilot setting off the nearly ten-minute long deadly descent. the pilot frantically knocking on the door pleading to be let back in the cockpit but there's no response. amidst the sound of screaming passengers, andreas lubitz is heard breathing normally until the moment of impact. >> they are listening to the breathing and considering the pattern they are hearing is with someone who is conscious, alert and doing something they intend to do. >> reporter: a horrifying realization for families of the

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