yards off the ocean floor and with an expensive and highly sensitive piece of equipment like this, you don t want it colliding with things, getting stuff and losing valuable time. that s whey thooy they re waiti that and focusing on the work on the surface. the ships like the hms echo. what it can do is give them a better picture before they start, wolf, of what they re taking pictures of so hopefully when they put the bluefin down there, it can be the most productive. because the big production to get it into the water and get it out safely, they don t want to lose any of that time through bad planning. very, very, very complicated. tom, thank you. colleen keller, senior analyst with the scientific consulting firm metron. worked on the search for air france flight 447. and eric is joining us from sydney, he s an oceanographer with the climate change research center. talk a little bit about these waters. how challenging, eric, are they