and their sensing techniques underneath the area and also a separate air search area, aircraft flying through the skies monitoring closely the surface of the ocean to see whether they can find debris of the missing airliner. you see that every day, almost. the search area has been getting smaller and smaller, and it s important to point out that s not because of any data they ve received, any new data that s been received. it s simply because they ve established these four separate acoustic events, four separate ping detections over the course of the past week. the last one was four days around and used that to triangulate this very rough area of the indian roeocean, where t think the most likely places where the airliner went down and you going through a methically by bit, bit by bit, to locate any sign of all of wreckage, locate the black box flight recorders from the malaysian aircraft are and so far have come up with nothing.