area down from the size of the state of massachusetts to maybe the size of the city of boston. down on the bottom to start finding pieces. there are some sophisticated sup submersibles out there today, robotics, that can go down and cut the pieces of the fuselage open to get out what we need to. any investigator is not only going to want to recover the black boxes but the cockpit section, perhaps the leading edge wing juncture points to see how sharp the tearing was that will give us a good idea how hard the airplane impact ed the water if it went in from low altitude at a shallow angle or high altitude at a sharp angle. so it's -- this is never going to be easy. >> sure. >> but it's just a degree of tift question. >> you're narrowing in increasingly and, john, if we are able to find a piece of debris and we're able to determine that it is a wing or some other part of the missing aircraft, what information will we be able to glean from that discovery? >> well, if you look back at air