The fact is, that the sonar recordings of the french submarine, which scanned the area last year right after the crash, were again analysed with more sophistcated methods/software. Now they seemed to have heard the signals of the boxes and could reduce the possible position to an area of only 25 squarekm, which makes another search much easier. But the mentioned terrain is very rough ( like the alps ), so it could be very difficult to locate at least small items of the wreck. Lets see..
skadi