an unexplained noise heard in the final second of the cockpit voice recorder seems to support that theory but the egyptian government says more analysis is needed. this morning, we have with us mike poole. a long time crash investigator and expert and data recorder analysis. good to have you with us this morning. >> good morning. >> i want to read something reported by cnn afgs france 2 and once of the investigators said an explosion was heard on that recorder. how much can be determined about the cause of that noise? can it be determined that it is an explosion simply by that cockpit voice recorder? >> well, there's been a lot of research done over whether you can tell the difference between the sound of a bomb and the sound of structural failure, which is called explosive decompression. at altitude, the aircraft is a vessel pressure. when you have a fuse language