At present, it is not too much for Malaysia Airlines to use the word "race against the clock" in search and rescue of the black box. The black box is the only clue that we know what happened to Malaysia Airlines. So far, the main black box has not been found. Although there are pulse signals, searching for the black box at the bottom of the sea is undoubtedly a search for a needle in the bottom of the sea. Therefore, the mystery of Malaysia Airlines' disappearance is likely to become an outstanding case, and even depends on us People will discover this mystery later.
Australian officials vowed on the 8th that they would continue to search for the black boxes of Malaysia Airlines flight mh370 in the ocean until they were sure that the black boxes would no longer send out pulse signals. They also said that the task of locating the black boxes on the ocean floor was "extremely difficult" and would not send submarines until further signals were detected.
But searchers are concerned that the black box signal 'may stop at any time' as the battery life runs out. The black box search and rescue signal may be terminated at any time, so it's better to prepare for the worst in advance. It's impossible for anyone to know whether Malaysia Airlines will become an unsolvable mystery in the history of aircraft!