their hat on one scenario or the other, in my view, is heading for a fall. the entire experience of crash investigations is that, yes, it's usually obvious but quite frequently, it's something you've never even thought of. >> there's no way to know until the black boxes are found. until you find the plane, you don't know what happened. what you won't know necessarily is why. >> there are no black boxes inside of human beings, and that is what we need in this case. >> our best hope of solving one of the greatest mysteries of all time presumably still lies somewhere at the bottom of the indian ocean. >> we need to know what happened. we need to know whether this plane came down at the point of