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It's a race against the clock for search crews trying to find missing malaysian airlines flight 370. the australian prime minister says that he's confident that four sounds, four pings potentially, detected by the "ocean shield" are from one of the plane's black boxes. >> but the hard part, the signals are coming from about 15,000 feet below the surface. >> now, let's bring in ocean explorer, fabien cousteau, who's speaking exclusively with cnn. you'll recognize the last name. the grandson of famed pioneer jacques cousteau. nice to have you with us. >> good morning. >> good morning. >> i wonde...

Prime minister and the head of the search, angus houston, believe are from the flight data recorders. the ocean shield still towing that ping locator on loan from the u.s. navy. also in that little tighter area, where they did get those pings, there's the british ship, the hms echo, which is an oceanographic ship, it has a two-mile wide beam, if you like that it can put down and try to get back information from the ground floor, and see if it can locate any wreckage. no luck so far. don, this is a very long and involved process, and isn't by far over. >> joe johns in kuala lumpur. if and when ...

Geoffry. will that lead this investigation? >> there's two elements to this. which probably haven't -- the two elements to this now. if we get no more pings, then we have to go to the bluefin-21 which has been talked about. however, there's one other asset that is working in this area which is the "hms echo." that's in the pinger search zone with our australian "ocean shield" which is towing the pinger locater. the "hms echo" is using echoes off the bottom. the bottom at this area is silt. they're hoping a large metal object like a big large airplane will give them a different sort of return, ...

About 18,000 square miles. this is where the search vessel, ocean shield, have picked up the pings that could have been from black boxes. so how did they find those pings? well, that vessel, ocean shield, was equipped with a navy locater. it can drop down to about 10,000 feet if necessary. meanwhile, australian air force planes are dropping sonobuoys into the ocean which release microphones that descend to about a thousand feet. now, they're microphones that can pick up signals a thousand feet below the surface. the investigators plan to keep searching, narrowing the site as much as possible w...

Urgency now. the batteries on the plane's black boxes due to run out and just days after expressing optimism about the missing jet, australia's prime minister now saying that the search could go on for a long time. dominic dinatale joins us live from l.a. with more. >> reporter: hey there. yes, it's been a process of elimination really in working out what these signals could be. was it a submarine that shouldn't have been in the area? prime minister of australia has been saying that he feels deeply, confident that indeed what the ocean shield has been picking up with the pinger that is being -...