isn't given to raising false hopes. he said it is the next best option but it will be a long and tedious process. as i say, to search that for one day, i mean, if people have been to manhattan, for example, imagine looking for a laptop that might be buried. we're talking about these black boxes. imagine looking for a laptop that maybe built in silt in the dark over the whole area of manhattan. that's just one pass. they've got their job cut out for them. i suppose their biggest hope is that they might find a large piece of wreckage. that will give them something they can work with. the ocean shield does have the assistance of hms echo. it has a two kilometer wide scanning ability. looking for anything hard on the ocean floor that could prove to be wreckage. >> the magnitude of this search operation is just extraordinary. hard to grasp statements. making holmes reporting there live from perth, australia. just after 3:00 in the afternoon