indicating the plane is losing altitude too quickly. >> the fact that he had all these bells and whistles going off to tell him that he was in trouble was almost to the point where it was too late. >> reporter: then loud banging on the door. the captain is heard shouting for god sake open the door. passengers are screaming. at 10:35, the plane is at about 23,000 feet and still rapidly deskendde descend descending. then bangs. 90 seconds later, another alarm is triggered in the cockpit that sounds like this. >> pull up. >> reporter: the captain pleads open the damn door. 13,000 feet the co-pilot is heard breathing steadily. they believe they heard the plane's right wing scrape a mountain. passengers are heard screaming once again before impact. cnn has not been able to