. >> 30 years ago tom clansry wrote "hunt for red october", he described how satellites could tect the heat generated by a submarine. they could detect it from under water and a pod of wales. if there's that infrastructure technology, couldn't that help source? >> you know, if this it were employed after the aircraft went down, that would have helped. if the aircraft went into the ocean, the whole aircraft has cooled off down to the temperature of the o. there's not much difference in heat signatures. detecting heat can pick out slight differences in temperature between objects, even at a great distance. but it helps to know where to look, and there's technologies that could be used like radar penetrating ocean service, and radar can penetrate ground surface and see subsurface structure. maybe it could have been used also. it's a question of where do we look, how soon can we get in to look at it. >> there's other limitations, cloud and others. you've seen the pictures that china released. resolution is low, lower than the images than in the crowd-sourced search images in what google ea