The world's most pristine and least understood ocean, the Arctic, is under threat from chemical pollutants, plastics and climate change. In the northern regions of Norway, Canada and Russia, how will warming Atlantic waters moving further north affect the life and ecosystems unique to the Arctic? Following the campaign of one man, Lewis Pugh UN Patron to the Oceans as he puts his life on the line swimming at the northern ice edge to fight for the protection of the worlds northern wilderness.