Descending past 65 feet, Troy "Lonefin" Williams freedives off in Saipan, in March 2009. Troy, who lost his right leg in a boating accident nearly 20 years ago, is one of the world's most accomplished free-divers and spear-fishermen. Adjusting his technique due to his disability, Troy is able to dive to depths of up to 80 feet. Troy's style of free diving has been likened to a dolphin as his single fin makes him more streamline in the water. [CFP]