Flight Data Record Terrify News Today

>> reporter: there are really three layers to the physical search right now. the one weve been talking about the most is on the surface of the water. we know where the plane took off, where it disappeared, we know they found debris and the water here is very rough at times. the surface matters because the surface is where you get your first clues. things floating on top of the water may or may not tell you a lot about the cause of the accidents. they are indicators. when you move to the second l...