black box. now, the pinger may only have a day or two of battery life left. that's why the move subsurface, they've got to do it now. meantime, nearly two dozen ships and aircraft will again begin combing the surface of the ocean. overnight officials said all of the leads garnered from satellite images turned out to be other things. they are still looking. cnn's matthew chance is live for us this morning in perth, australia. walk us through these latest developments. you know, the pilots are still coming back empty-handed. they're spotting some things, but so far, nothing has turned up, and the search now has moved under sea, matthew. bring us up to speed. >> reporter: yeah, it's a new phase of the search operation. it's gone subsurface, according to the search organizers here in the australian city of perth, and that's for two reasons. you've mentioned, you've hinted at both of them. the first is that they've only just now managed to get the assets that they need in the search area to start an underwater search. they've got a british nuclear