For Sport Relief 2012, Blue Peter presenter Helen Skelton is travelling 500 miles across Antarctica to reach the South Pole by ski, by kite and.... by bike. Helen is hoping to reach the pole and set a new world record for the longest-ever bicycle journey on snow.
A specially designed ice bike, which weighs less than 20 kilograms and took years to develop and build, will take Helen on her epic mission. It has been specifically treated to withstand the harsh Antarctic conditions and the 20 centimetre-wide tubeless tyres will provide maximum stability and traction on the ice.
All the action from Helen's Polar Challenge will be shown in a special nine-week series on Blue Peter from the end of January. To keep in touch with the action follow on the CBBC website.