Korean star Song Ji-hyo will undertake the greatest challenge of her life: free diving with the legendary haenyeo female underwater sea fishers, who she feels a special connection to. The haenyeo are keepers of a precious tradition that has been passed down from generation to generation for at least 400 years.

The extraordinary lives of Jeju Island's female free divers are brought to the surface as one of South Korean TV star Song Ji-hyo, continues her challenge. As she tests her limits, Ji-hyo discovers how the changing marine environment coupled with an ageing population threatens the Haenyeo heritage.

Song Ji-hyo continues on the greatest challenge of her life: free diving with the legendary Haenyeo female underwater sea fishers and explores what it will take to preserve their way of life.