150-mile tracks. it s an arduous task, a slow task. there s still going to be something in my brain saying we need to send an asset down there just to make sure this is not what they re saying it is. that s exactly what happened with the chinese satellite. sorry, don. that happened with the chinese satellite pictures right at the beginning when they found satellite pictures on the friday night in the south china sea and everybody was off to the races. i think this is more specific, though, richard. 37.5 kilohertz. there aren t many of those knocking around the ocean. as on ration l commaoperational would cast doubt in my mind. what did he say earlier? tittle tattle? i don t know what these things are. if crews can t figure out where flight 370 went down, the big question is how much can be salvaged? up next, we re going to take a look at some of the challenges that may be ahead. s an expert.