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Further step towards visual identification, since it offers a possible opportunity to detect debris from the aircraft on the ocean floor. i would caution you against raising hopes that the deployment of the autonomous underwater vehicle will result in the detection of the aircraft wreckage. it may not. however, this is the best lead we have and it must be pursued vigorously. >> it is a tedious process, too, as angus houston was cautioning people. it's a 24-hour effort to get this thing down, 2 hours down, 16 hours at walking pace, where it maps the ocean floor using that side-scan sonar, 2 hou...

Homes that it will find something. it will be a very long process. a very tedious one. the bluefin moves literally at walking pace. for a cycle of it going down and coming back up takes 24 hours and in that time it covers about 40 square kilometers. this in a narrow search area of 1,300 square kilometers. so they're hoping it will find something. it tries to find wreckage. it takes 3d photographs of the ocean floor. they're hoping but they're certainly not getting ahead of themselves in optimism. >> reporting live from perth, australia. many thanks. of course, the families of those on board ha...

Very long process likely ahead. blue fin moves at about walking pace. you're looking at that area on the screen. it will only stand about 15 square miles in its first 24 hour mission. it takes as you said two hours to reach the ocean floor. 16 hours to scan the area. and another two hours to return to the surface and then about four hours to download the data. the data is not streaming live. they have to wait until blue fin rurps to the surface to view it. this could be a long haul. air france, the wreckage was nearly 7.5 miles from the plane's last known position.

Heading up this search. the main one is that they've decided they're not going to hear any more pings from this flight data recorders. and they're going to have to deal with the search area they've narrowed down to now. they were hoping against hope they would get more pings which would help them narrow it down even further. the area they're dealing with is about 1,300 square kilometers. later today they are going on pull up that ping locator and lower the bluefin submersible. it is a 24-hour operation to do one sweep of about 40 square kilometers. two hours down, 16 hours going along at a wal...

There's also the "echo" there, a british ship that sends down its own sonar and tries to pick up any hard objects on the bottom. but, yeah, you've got to think and you were just saying this and you're right, don, you've got to think it's got to be only a matter of a day or two before they say those pingers are dead now and we've got to use the information we've got. and send down that submersible and have a look on the bottom and see what we can see. tony abbott, the australian prime minister, he's right when he says it's a massive, massive task. even going down and having a look under t water...