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What really happened on its flight data recorders. >> we cannot be certain of ultimate success in the search for mh-370, but we can be certain that we will spare no effort, that we will not rest until we have done everything we humanly can. >> reporter: who steered the plane offcourse and why? what happened inside the cockpit? where did the aircraft go down and when will we find a trace? theres an abundance of theories colliding with an absence of evidence. after four weeks here, like everyone e...