VIDEO: Alex Hibbert's record-breaking journey will start at Quaanaaq in Greenland - over 300 days he'll walk almost 3000 miles to the North Pole and back. Rachel Hepworth asked him....WHY!!? You can follow Alex's progress on this website.
Hungry polar bears at night could be one of the fiercest dangers that Portsmouth-born explorer Alex Hibbert faces when he tackles one of the last great Arctic challenges.
Moving fractured sea ice, unpredictable weather conditions and temperatures as low as -50C could also throw up problems as he makes an unsupported attempt to reach the North Pole in the depths of Winter.
He sets off today.