Imagine skiing the distance from Cairns to Adelaide, lugging a 200-kilogram sled behind you, in temperatures as low as -60 degrees Celsius.
You're traversing snow and ice, travelling through glaciers which have never been explored, and you're doing it all with nothing but the support of the person next to you.
That is the challenge UK-born surgeons Richard Stephenson and his brother-in-law Gareth Andrews are tackling as they take on what has been dubbed The Last Great First — attempting to become the first people to complete an unsupported coast-to-coast crossing of Antarctica.