A team of polar explorers has travelled to the Arctic in a bid to discover how quickly the sea-ice is melting and how long it could be before the Arctic summer becomes ice-free.
Pen Hadow, Ann Daniels and Martin Hartley will be using a mobile radar unit to record an accurate measurement of ice thickness as they trek more than 1,000km to the North Pole.
They will be sending in regular diary entries, videos and photographs to BBC News throughout their expedition.
Martin Hartley gives his final thoughts on the journey ahead before the team sets off - and shows us what kit he will be taking.
One-Minute World News 
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