Acclaimed South Korean actress Song Ji-hyo will immerse herself in the centuries-old tradition of the haenyeo this month. The haenyeo are female free divers from Jeju Island known for braving dangerous depths without modern gear to gather seafood. In a new documentary series for broadcaster Jtbc and BBC Studios, Song will spend a month compressing the typical three-decade training into learning the haenyeo’s techniques.

The three-part series “Deep Dive Korea: Song Ji-hyo’s Haenyeo Adventure” marks the first co-production between Jtbc and BBC Studios. It will air on Jtbc in South Korea and BBC Earth across Asia. The show aims to highlight the fascinating world of the haenyeo, many who continue diving into their eighties. Despite the risks, the haenyeo tradition has been preserved for over 400 years as a vital cultural practice on Jeju Island.

At over 40 years old, the challenge will be daunting for Song. However, her connection...