united states, don't we have sophisticated outposts in the indian ocean that would pick up something that size? >> that's right, chris. in diego garcia, there's a number of assets the u.s. has. some of our closest allies like australia, they were all working it but this is a vast amount of sea space to cover to try and find it. and you have to do that basically from the water. air assets can support that effort, but mostly you've got to pick up the initial ping based on either something that's observable or hearable in the water or on the water surface. >> bob, the idea of coming to a conclusion that investigators seem -- that they believe somebody turned off the transponder, somebody disabled the other communications equipment, which may have involved going below to do it, do you believe there's a substantial and sufficient basis for that finding? >> well, i think the thing you