operations and submersibles specialist. colonel michael kay, former uk military pilot and cnn aviation analyst. tim, you've joined the panel since the last hour. and you've brought with you a very significant prop. better known as an auv. explain how this is significant in what's happening on the other side of the world. >> actually, this is more than a prop. it is an actual auv. it just is a shallow water version. when we talk shallow water we're talking 200 meters, 650 feet. so it will actually go down on its own and it will use its side scan to map the ocean bottom. >> effectively what we're looking at now is this would be step two. they are listening with the phones, driving the phones along for lack of a better description. now that they've got just a little piece of evidence of pinging this goes in next to start looking? >> the blue fin 21, what the navy has supplied, will be doing the work. it's a much larger system with a little bit more sophisticated navigation instruments. because it has to go so deep.