even our maintainers on the ground, our mission is to fly these planes and to search. and the way i think of it personally is, each of those people on that aircraft, they have families associated with them and friends. and i know they want closure no matter what happens. and i know if it were me and my family i'd want the u.s. navy out here looking and that's what we're doing. >> commander marks, i'm glad you're out there. thank you. >> you're welcome. thank you. >> incredibly difficult task right now. digging deeper, i want to bring in a veteran of these kinds of things, david gallo co-leader of the search for air france flight 447 also retired airline pilot ron brown. david, you heard the commander there saying they're searching off the coast of australia because they've already basically thoroughly searched the northern part of the indian ocean. do you basically just keep on expanding out until they've searched the entire area the plane could possibly have reached given the amount of fuel it had?