Underwater Pinger News Today : Breaking News, Live Updates & Top Stories | Vimarsana

But that means there are 132 people who are still missing. breaking overnight, malaysian officials aiding in the search tell cnn this is the most probable location of airasia flight 8501, an area just over 2,000 square miles, keeping a close eye on the weather that hamper the efforts for days, crews have yet to discover the crucial black boxes needed to solve the mystery of the crash and the clock is ticking in the race to find them. the battery used to power the pingers have about 24 days until they expire. at least three ships using underwater pinger locator devices are set to comb the area ...

Microphone. this is the type of device are going to be using either towed behind a boat in long tails or in order to listen for that underwater pinger. >> how far can it hear? how wide? >> only about five miles. >> so this is how you're trying to find the basic area of where any flat data recorder might be. >> exactly. you need to find the wreck site. >> so if we go from there, let's take a look at the sonar. because the sonar is what you're going to do if you get closer or if that battery dice on that flight data recorder. >> so this is an example of the sonar. the sonar is going to actively ...

Microphone. this is the device they're going to be using either towed along a boat in long tales in order to listen to the underwater pinger. >> how far can it hear, how wide? >> only about five miles. >> so this is where you are trying to find the basic area of where any flight data recorder might be? >> exactly. you need to find the wreck site. >> if we go from this, let's take a look at the sonar. the sonar is what you're going to do if you get closer 0 if that battery died on the recorder? >> exactly. as it receives a signal coming back from the seafloor, it's going to interpret that and b...

He's going to show us the hydrophone, show us the difference between this and son sonar. how does this work? >> this is a hydrophone and there's a number of varieties of them, but basically it's an underwater microphone. this is the kind of device they'll be using in order to listen for that underwater pinger. >> how far can it hear? >> only about five miles. you need to find the wreck site. >> if we go from this, let's take a look at the sonar. the sonar is what you're going to use if you get a little bit closer. >> this is an example of a sonar. it will emit sound and as it receives it back,...

And now they'll be used to locate the critical pings and hopefully that wreckage. then the sonar comes in creating whael a 3d map of what is on the ocean floor. here's cnn's stephanie elam off the coast, to show us exactly how these work. >> reporter: it is really interesting sec knowledge. and it say difficult task i'm talking about. i'm joined by a senior oceanographer showing us the hydrophone. how does this work? >> exactly. this is a hydrophone. there's a number of varieties of hydrooffense but basically a hydrophone is and underwater microphone. this is the type of device they're using e...