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The start tomorrow. we have more shapes in the area. we are ramping this effort up. >> for now it's another dark night for the families who have known only disappointment and grief since flight 370 vanished now back on march 8th. at the launching point for the searches there in perth, australia. 2:00 your time. we know this vessel, the ocean shield will be out looking for the black boxes. we keep reiterating the fact that the batteries will be gone in a matter of days. why is it taking so long to get this thing out there? >> reporter: the first step was it had to get here from the united state...

For pings from the black box and the cockpit voice recorder to figure out how the plane went down. how close does it need to be? here with me with answers and how long it could potentially take it sea operations specialist tim taylor. nice to have you back on here today. let's begin here. they will deploy the tpl and listening for the pings. we keep going back to the analogy of the needle being the black box. if they don't know what the haystack is because let's be real, they don't. how is this supposed to work some. >> it's such a long shot. it's like looking for your cell phone thrown out th...

Into the water where the area and is then the buoy will float with the debris. they use that method and a plane came back around and found it again so now ships are on the way. it's a big moment. >> it is, but they're going to locates the debris field, they're going to then get to the site, pick up the debris, examine it, identify it, collect data from that, and then put in the tpl-25, the toe pinger locator and try to pick up the found that at this point we're 20 day into it. the battery is running low. it's much shallower depth so we'll have hopefully have greater success. >> at some point w...

I say we hope, because you really need a good sense of location before we deploy these. one is the tpl 25. that's the today piad pinger lo. hydrophone. can go down to a depth of about 20,000 feet and just liston any sound it here is. so if that black box is down there and it's within range, it will hear it. the key point being there in range. these black boxes don't have a huge range. maybe a couple thousand meters. so you really have to have a good sense of where this thing is. otherwise if we're on the wrong spot we'll never hear it. just to give you an example to draw a picture of how huge ...

United states navy has that's run by their salvage division of naval sea systems command. they are able to employ those in the event of one of the navy's planes go missing but it's also -- you know, has obvious civilian applications here. but combining the blue fin with tpl 25 which is the black box detector, those are essentially in the region for contingency purposes. you have to pretty much know where the aircraft is before either of those pieces of equipment would be very useful. >> understand. sam lagrown, thanks so much. we appreciate it. >> thank you. still to come on the nutrisystem ...