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Sub had descended too far below the ocean surface. now, the bluefin-21 is called the best hope yet for finding wreckage from the jet, and this morning, search crews are preparing to lower it again into the indian ocean to look once more for the plane's missing for now 39 days. erin mclaughlin is live in perth with the latest on the search. erin, up to this point, there had been this thought that the bluefin was going to save this mission, it was going to save this long search for 370. and on day one, no answers. >> reporter: victor, i think the important thing to remember here is that nothing ...

Clouseau, miles o'brien, mary sciavo, and clive irving. okay. i got that out. mary, why the larger search area today? does that tell you anything about the people running the search? >> well, yeah. it does. it tells me they want to try a last couple of days of effort for a big look to see if there's any hope whatsoever of finding wreckage. clearly, if there is even wreckage, it's spread further than before and before they put the blue fins in the water to start mapping the ocean floor, i think it was one last-ditch effort to please, you know, send us some wreckage so we can know we're in the r...

Size of -- maybe a little smaller than new mexico now. then the prime minister seemed to intimate that the search area for the black boxes themselves is much smaller than that. is that what he meant, rob? >> he's saying -- he's implying that the pinger location is an area of high probability within the overall search area. again, we're not dealing in an exact environment. when you're dealing with acoustics or sound under water, sound can bend, it can bounce, it can be inflinsed by a lot of factors. until you actually have eyes on the wreckage, you can't be completely confident. >> david, let m...

But this data can be disseminated probably in a week's time or less from what i know. it's a process. once that process starts occurring, you can put in a program that will actually show what the airplane was doing, both from a profile point of view and from within the cockpit. so it will be exciting stuff. in addition, the fact that you recover black boxes, you can recover part of the wreckage with it which might mean you'll find the tail depending on how the airplane impacted. that will tell us a lot, too, just by finding wreckage. >> obviously these black boxes are critical to solving this ...

Cart. what good will that cart do but maybe a few seconds. we appreciate it. finding wreckage from flight 377 depends not only on where it crashed but also how it hit the water. gary tuckman explains. >> not a speck of wreckage has been found from malaysian airlines flight 370. is it possible that all the wreckage sank? >> the chances of no debris? very, very remote. >> the amount of debris on top of the water would vary based on the scenario of how it when down. for example, if it went down in a steep dive at high seas. >> the wings were dorn off. large parts were torn apart.