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" There were the sounds of the pack in movement—the basic noises, the grunting and whining of the floes, along with an occasional thud as a heavy block collapsed. But in addition, the pack under compression seemed to have an almost limitless repertoire of sounds, many of which seemed strangely unrelated to the noise of ice undergoing pressure. Sometimes there was a sound like a gigantic train with squeaky axles being shunted roughly about with a great deal of bumping and clattering. At the same time a huge ship’s whistle blew, mingling with the crowing of roosters, the roar of a distant surf, the soft throb of an engine far away, and the moaning cries of an old woman. In the rare periods of calm, when the movement of the pack subsided for a moment, the muffled rolling of drums drifted across the air. "
― , Endurance: Shackleton's Incredible Voyage
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" Nor did the Antarctic represent to Shackleton merely the grubby means to a financial end. In a very real sense he needed it—something so enormous, so demanding, that it provided a touchstone for his monstrous ego and implacable drive. In ordinary situations, Shackleton's tremendous capacity for boldness and daring found almost nothing worthy of its pulling power; he was a Percheron draft horse harnessed to a child's wagon cart. But in the Antarctic—here was a burden which challenged every atom of his strength.
Thus, while Shackleton was undeniably out of place, even inept, in a great many everyday situations, he had a talent—a genius, even—that he shared with only a handful of men throughout history—genuine leadership. He was, as one of his men put it, "the greatest leader that ever came on God's earth, bar none. "
― Alfred Lansing, , Endurance: Shackleton's Incredible Voyage