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The 'Endurance' leaning to one side during the Imperial Trans-Antarctic Expedition, 1914-17, led by Ernest Shackleton. (Photo by Frank Hurley/Scott Polar Research Institute, University of Cambridge/Getty Images)

The 'Endurance' leaning to one side during the Imperial Trans-Antarctic Expedition, 1914-17, led by Ernest Shackleton. (Photo by Frank Hurley/Scott Polar Research Institute, University of Cambridge/Getty Images)