Limbless swimmer's ultimate trek

French amputee and swimmer Philippe Croizon poses with a French flag in Wissant, northern France, after he swam the English Channel in September 2010, a challenge he spent two years preparing for. Croizon is now training for a new challenge: to cross five continents in waters marked by sharks, poisonous jellyfish, icy currents and cargo ships. Philippe Huguen / Agence France-Presse