South Korean female sea-divers who swim 65ft to the ocean floor and back without breathing apparatus for six hours a day... until they are NINETY
http://www.dailymail.co.uk/travel/travel_news/article-3112414/Pictured-incredible-South-Korean-female-sea-divers-swim-65ft-ocean-floor-without-breathing-apparatus-six-hours-day-NINETY.html