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BBC News UK
Devon explorer Pen Hadow - the first person to walk solo across pack ice from Canada to the North Pole nearly 15 years ago - is embarking on a new mission to the region.
He wants to become the first to sail there by yacht, saying he wants to show how far the ice has melted because of climate change.
Mr Hadow said he has a reasonable chance of completing the challenge because the Arctic sea ice was continuing to recede.
He said: "This year it's quite possible that it may be nearer 50% by the end of the summer. Essentially the sea ice is thinner and thinner, and it is weaker and weaker, and there are more and more cracks within the main body of the remaining sea ice cover."