help me understand what's going on here. first, david gallo, good to have you. you were pivotal in finding flight 447. we will bring you in on the discussion. david, i haven't spoken to you yet this morning. if the plane dipped in altitude which is something you and mary have been asking a lot about, we need to know altitude, if it did it in that point of the flight, tell us where was that and what sense you make of a dip in altitude at that point. it's too soon to be out of gas. >> it is. it seems to me close enough to the turn that it would have had something to do -- indicate to me a rapid decompression on the aircraft because the first thing you want to do is your flight change or the flight level change button and it's going to go to the predesigned altitude. >> rapid decompression, meaning an accident something beyond the control of the pilot as opposed to intent. do you agree with that? >> yes. outside my zone of expertise but, yeah, it sounds like that rapid motion like that, something that severe would be just what david said.