missing malaysian plane with no luck. nearly three weeks ago, the towed pinger thought to be from the plane s black boxes and the second ping was the highest quality and that s why they launched the bluefin in this small area first. the bluefin is being pushed to its limits, diving deeper than it is designed, using side scan sonar and then resurfaces so data can be analyzed. it s something familiar to david gallo, who was part of the search for flight air france 447. it s a matter of sitting in a room with a white board and there was a long period, months before we came up with the next plan of what to do. reporter: it took 75 days and over two years to find that wreckage. in this investigation, the subsea search area could be shifted or expanded and perhaps to include the other three pings
room with a nice clean whiteboard and going through what we know, what we don t know, what do we do next? it took a lot of thought. it was a long peer. months before we came up with the next plan of what to do. reporter: it took 70 days of subsea search missions over years to find that wreckage. in this investigation, the subsea search area could be shifted or expanded perhaps to include the other three pings and using other vehicles to scan the ocean floor. this remis 6000 was used in the search for air france 447 and can go deeper than bluefin. another option, a towed sonar system like the orion which can scan large areas under water. whatever the system, gallo suspects this general part of the ocean to still be the target. i don t know how you leave this place before you take that area of the sea floor apart completely. the ship used in the subsea search efforts cannot be refueled at sea so will eventual eventually have to return to