I spent six weeks in the Canadian Arctic on an Ice Base on the frozen Arctic Ocean at 78 degrees north (at the spot often referred to in polar races as ‘The North Pole’, though in fact it was the 1996 location of the magnetic North Pole).

After cycling from England to Cape Town I needed to find a way to get to South America.

In 2012 Alastair rowed across the Atlantic Ocean.

My head is thumping. My eyes are stinging. I’m weak with thirst.