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Problems. confirm that there is anything down there obviously. and there is a lot of silt on the ocean bed apparently. this can be churned up by the american bluefin, on the ocean bed. complicated exercise and have a long way or certainly some days before we can confirm one way or the other is that these coming from mh 370. greta? >> thank you. now that searchers have detected more pings, what are the next steps locates the black box or other plane wreckage: team out on the ocean shield right now. mike joins us. nice to see you, mike. >> thank you. mike, i may be jumping way ahead, but, you kn...

And we're told one of these microphones picked up what they believe could be a signal from an in flight data recorder. they need to check it out. that's why there's data analysis that will be happening through the overnight hours in perth. we also got a new tidbit of new info. we know the british ship, the "hms echo" that was with the chinese ship that thought they heard something, they cleared that area. the british ship is moving to join the "ocean shield." we know that ship will be in the area as well listening to see if they can get a lock on more possible signals. a lot to follow here, ca...

Welcome back to "the lead." i'm jake tapper. continuing our world lead now, the many new developments now in the search for flight 370, including another potential ping coming from the ocean floor and leaving authorities to narrow the search zone even further as they try to locate the black boxes. the australian agency coordinating the search says this time it was a sonobuoy that detected a possible black box signal. the first four signals in previous days were detected by a u.s. navy towed pinger locator aboard the "ocean shield." that ship is also carrying one of the navy's underwater drones...

Welcome back to a special prime time edition of "the lead." i'm jake tapper. and what was once a sprawling search area has now been hacked down dramatically thanks to two fresh sets of pings, echoing from deep underneath the indian ocean. i want to bring in cnn's tom foreman. tom, every ping gets them closer. just how close could they are right now to zeroing in to the search pings? >> well, jake if we believe what they're seeing, we could get a lot less than the 3 million they're talking about. this is how they have done it. if you go flying in along the satellite arc up here and you follow t...

Search area, trying to reacquire a signal. and the search for debris is taking place to the west of there. talk to us about that effort. >> that's right. some 14 planes and 13 ships continuing to scour the waters for any signs of plane debris. they're now looking in an area that's based on a current analysis, using the information they've been able to acquire from the believed flight path, as well as from the pinger locations detected by the ocean shield. they've been able to narrow down that search area to less than a third of what it used to be. some 22,000 square miles. but officials saying...