what thauz that does is it helps those out there searching, who are dragging that ping locater on loan from the u.s. navy. they are trying to get more pings today. what that will do is help them triening a late, if you like -- think of it looking for a cell phone tower and the pings of the towers, it helps to work out where the best spot to search for those flight data recorders are. of course it's a very difficult task. it's a vast area. on the bottom of the ocean floor, by all accounts, there's perhaps meters of silt. so it depends how these things, if they are there, hit the ground, hit the ocean floor, and maybe they are buried in silt which will make finding them even more difficult. that's the aim today. what we heard from the man who's heading up the search effort here, he says he was optimistic they would find the wreckage because of what data they have received so far. that coming from a man not prone to exaggeration or raising false hopes. he's a very mild-mannered gentleman. if he says he's optimistic, than that really is a good sign. don? >> we have been paying close attent