>> in every major crash investigation that's what you do. you map where you find pieces because there may be crucial clues as to how the pieces are left. in this case a striking amount. the blowback from the plane itself, the law of physics, the opposite reaction from hitting the mountain will cause pieces to be widely dispersed but they want to answer other questions. was there an explosion when it hit the mountain of the fuel tank? a fire or not a fire. curious it doesn't look like there was a fire. all of these things that they can help answer by mapping the debris field. >> richard, when you talk about those final minutes, we look at the path, it didn't deviate from the path. that's something you highlighted as well. one would think if they are in distress, they may deviate from the flight path. it didn't seem to do so. >> if they were in distress and needed to land quickly, there were airports close by that they could have easily made. why didn't they go to those