if in fact the last eight or ten minutes of that cockpit voice recorder has no sound from human beings the pilot or co-pilot or anyone else for that matter, tell our viewers what that means. >> well it certainly fits a scenario where you had some sort of decompression event, wolf. some event where the pilots were overcome by hypoxia, lack of oxygen. we saw this crash, this type of crash a few years ago over greece. the helios air crash, decompression was gradual, the crew eventually lost consciousness and the plane flew on on auto pilot. however, it didn't go -- descend in an erratic way which is what we see here. this is not a classic emergency rapid descent, nor is it really just a simple auto pilot descent unless there was some problem with the overspeeding. so the other side of this is it could have been some sort of deliberate act of some kind by either the crew or some other