British-South African Lewis Pugh has been a pioneer in long-distance swimming for close to 30 years. He was the first person to complete a long-distance swim in every ocean of the world, his most well-known expedition being the first-ever attempt to swim across the North Pole in 2007. This effort was to highlight the melting of the Arctic Ocean ice. His latest endeavour was to swim down a river under the Antarctic ice sheet to call for greater protection around the continent.
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