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
balance between public safety and free speech. susan candiotti reports on it now. reporter: marching around manhattan s financial district, protesters are baiting the drama against corporate greed, now in its fourth week, occupy wall street is creating a delicate balancing act for police between free speech and public safety. as long as these demonstrations go forward, we re going to do everything we can to see to it that they are done peacefully and in an orderly fashion. reporter: but unlike most new york protests, 600 each year in lower manhattan alone, occupy wall street isn t applying for permits. police say it s created a communication gap. we have nobody identified as a leader who we can communicate to. in a normal process, we talk to the leadership, sit down. there s a permit that s issued. we know the route of the march that people are going to tyke. reporter: the majority of marches are peaceful but there has been trouble, use of pepper spray, swinging bat
scanning ability of images that people desire to acquire, for example. i want to show you a picture we have here, a graphic we have which shows one of these sound bullets being used on someone s brain. what are the medical applications of this? so that s a schematic diagram that represents one of the potential applications of our technology. the idea of being able to focus sound in a very narrow spot and with a much higher precision, higher energy so that you can either, for example, image parts of the human body or focus energy so that you can increase the temperature in, for example, cause death, or undesired cells, for example, tumor cells. this is a technique used in technology today. and finally, where you said, you said we re some distance away from what i showed in that movie clip.