“When my hero, Ernest Shackleton, was 97 miles from the South Pole on the morning of January the 9th 1909, he said he’d shot his bolt. Well today I have to inform you with some sadness that I too have shot my bolt.” That was Henry Worsley’s last message from his attempt to cross Antarctica unaided. He was later rescued 30 miles short of his destination, but sadly, he died of exhaustion, dehydration and other complications.