Page 6 - Miles Deep News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Is left of the aircraft, in the not too disstant future. >> reporter: detections boosted optimism but crews are listening for even more to narrow the search arrir area, and they're borrowed time. >> given the guaranteed shelf life of the pink batteries is 30 days, and it's now 33 days since the aircraft went missing. >> reporter: investigator says they will only launch the underwater vehicle bluefin after they are search the batteries are dead. the bluefin can launch search missions that last nearly a day. but it's slow. it would take six times longer to cover the same area as the tow pinger l...

Does noise travel, right? so here is the easiest way to put it. low pitch sounds travel farther. so that's why you hear whales at far distances. high pitch sounds travel very -- they don't travel as far. and the pinger is a high pitched noise. so that's why we hear experts say it's a two mile radius. and you mentioned the ocean perhaps three miles deep, right? so i said, okay, so if the pingers at the bottom of the ocean and it's two or tree miles deep and the radius is two miles, what does that mean at the surface? what does that mean -- and he put it like this. this is like going to vegas an...

Plane. let's look at the underwater devices used. tom, we heard from rosa. how they're using these different pieces of technology, how will this work? >> in a simple sense, think about what rosa said there, you can get the broadest picture from the least precise equipment. the more precise you get, the slower it all gets. you think about what the chinese were using. they basically went out with a small listening device that wasn't really designed for this type of thing. they said they read something. one thing they doubt that is that pinger is really made for shallow water, not really made for...

That underwater autonomous vehicle, it would be a very, very, very long time before they could verify or find any sort of wreckage. christine? >> tell us about the difference in the signal strengths. is that casting any doubt on their findings? >> reporter: well, the signal that they detected is a total of 33.2 kilohertz, and they're expected to detect a signal of 37.5. houston addressing that at the press conference earlier today, saying that that doesn't necessarily diminish these results, given the conditions out on these vast, deep ocean waters, some 2.8 miles deep. sound can do funny thin...

In very deep oceanic water, nothing happens fast. >> reporter: now, at the moment, the "ocean shield" is currently in the area where it detected the signals. what they're trying to do now, use that towed ping locator provided by the united states to detect possibly a third signal. if they get that third signal, their hope is they'll be able to triangulate a narrow search area in which they can deploy the bluefin 21, also provided by the united states. it's an unmanned autonomous vehicle, able to go underneath the water. the hope is that they will find some signs of physical wreckage. they say ...