Now, a new study reveals that these women carry distinct genes not found in South Koreans living on the mainland. These genes may be linked to the women's abilities to withstand frigid water and lower their blood pressure while diving, the scientists wrote in a study published Friday (May 2) in the journal Cell Reports.

Jeju Haenyeo — which translates to "women of the sea" — begin diving for seafood at around the age of 15, gathering abalone, sea urchins and octopuses. According to UNESCO, members of the group harvest for up to seven hours a day for about 90 days of the year. They continue the practice well into their 80s, not even taking a break when pregnant.