up sound from juunderneath the water. how hopeful should we be? >> well, carol, i'm very hopeful that they are on the right place now. when you look at the accumulation of evidence and the repeated pings that all match, all the specifications we expect, i am confident they are on the right place. the fact that the p-3s now think they may have picked up something is even better news. that means the batteries are still alive. and it lets them refine the area they're going to have to look on the ocean bottom even better because it's a small area. but the smaller they get it, the faster the rest of the bottom search will be able to proceed. >> so fred, why can't they find debris? >> from what i understand, one, we don't know how the plane went into the water. but from what i also understand, there was a pretty strong storm several days after the plane went down. so that debris, along with the storm and with the currents, could really be hundreds and