LONDON, ENGLAND - OCTOBER 19: Prince William, Duke of Cambridge poses with Henry Worsley, who will attempt the 2015/16 Shackleton solo challenge where the Polar explorer will be attempting to undertake Sir Ernest Shackleton's unfinished journey to the South Pole from the Weddell Sea at Kensington Palace on October 19, 2015 in London, England (Photo by John Stillwell/WPA Pool/Getty Images)
