The document discusses the Ama divers of Japan. The Ama divers are groups of women in fishing villages along the coast of Japan who work as independent divers, making their living by diving to collect pearls and seafood. They can dive to depths of up to 25 meters using only their breath-holding skills and without oxygen equipment. Most Ama divers are now aged 50-60, as many young villagers are leaving for jobs in cities, threatening the future of this profession.