greg stone and robert goyer are here. greg knows just how much we don't know about the ocean. ean scientist who specializes in undersea technology and exploration. robert is the editor in chief of flyer magazine. he says that even if the searchers are in the right area, it's no guarantee they're ever going to find anything. mr. stone, let me begin with you. "the boston globe" says you are the swash-buckling indiana jones of the sea. which means you're the perfect person for me to ask. how much or how little do we really understand of ocean geography? >> we know more about the back side of the moon or the surface of mars or what's going on on venus than we do about a detailed map of our own sea floor. for example, there are vast mountain ranges in the ocean. and some of them we visited, most of them we haven't. some of them we only know exist because satellites detect heavy gravity over certain parts of the ocean. we know when there's heavy gravity there's got to be more mass. so the actual topography of the sea floor is not very well mapped. >> speaking of maps, you gave us a m

miles o'brien and the editor-in-chief of flying magazine, robert goyer. you heard the reporting.epping up security in the cockpit. this could be because they are concerned about people from the plane coming into the cockpit. it also could be they are concerned about the pilots and how many pilots are in there, whether one pilot can lock another out. we're unsure exactly what those changes are. but what does it say to you about what they know about what may have happened? >> well, it implies that they think it's possible that somebody came from the passenger cabin and attacked the pits or tried to take control of the flight successfully, took control of the flight. because there would be no reason to take, you know, a big step like this, especially a public step if they thought the pilots were at fault because had it would make the pilots more invulnerable to being stopped in the act. it implies perhaps they think it was a passenger involved. once again, they're leaving us in the dark as to the details of it. >> right, miles, they are. it could be some sort of security where there

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