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However, as the days stretched into weeks, the leads began to diminish. The exhaustive ground searches yielded no new physical evidence, and the advanced technical tools that investigators relied upon reached the limits of their utility. The agonizing silence from the investigative task force in the days leading up to the announcement had prepared many for the worst, but hearing it spoken aloud by a figure as trusted as Guthrie transformed the theoretical possibility into a crushing reality. During the broadcast, Guthrie emphasized that no stone had been left unturned, a testament to the dedication of the men and women who had refused to sleep until they found an answer.