Malaysia Airlines' passenger aircraft with 239 passengers a year has passed over the loss. But still could not trace the aircraft. Even Australian Prime Minister Tony Abbott said at last, "I do not promise that it will continue with the same intensity of the search operation." He said. Between the cockpit and control tower made the remarks at the last meeting, '' Well, good night, '' was described as. Was first focused on the signals from the black box of the aircraft is believed to be breached in a large area in Kazakhstan began exploration in the Northern Hemisphere than in the Southern Hemisphere Australia. The source of the signals were in the ocean came full depth of 4572 meters depth .. It falls from the level in 2012, where France passenger plane belonging to 600 meters deep. This difference was greatest indicator of how the work is challenging.