Quadruple amputee Philippe Croizon swam between islands in the icy Bering Strait to cross from America to Asia in the final part of a quest to link all continents. The Frenchman braved strong currents and near-freezing temperatures in a roughly four kilometre swim between the US island of Little Diomede and Big Diomede in Russia that he said took about one hour and 20 minutes. After reaching the Russian island on Friday, he said that was the hardest swim of his life with a water temperature of four degrees Celsius and strong currents. The 44-year-old Croizon was accompanied by long-distance swimmer Arnaud Chassery, 35. Since May the pair swum across three other straits separating the continents and Friday was the last.