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A future voyager would simply have to follow one of these two currents to the precise place where it meets the ice; here he would find the ice cap softened and weakened by the steady pulsing warmth of a tropical sea-river—and there he could pass through a slushy portal that would lead straight to the Open Polar Sea. Bent had an intriguing name for this theoretical portal; he called it the Thermometric Gateway to the Pole.
