that whole formula of what makes it most likely for it to be here is the presence of this. this is a 35 billion dolls navy plane called the pa-poseidon. it is the most advanced plane in the world. it is able to cover thousands of square miles in the course of a single flight searching for any sign of debris on the surface. it is not perfect but the presence of this plane is an effort to overcome the physical limitations of looking at the water. where to watch is off the coast of australia. >> somebody on our air said it is like looking for a needle in a haystack among many, many, many haystacks. it is such a gigantic area, 2.24 million square nautical miles.