Haenyeo are women divers who presently live only in Korea and Japan where the women from Korea live on Jeju Island, representing the island’s traditional occupations for living. From the viewpoint of marine cultural historians, haenyeo has contributed to the active transmission of diving skills and ecological knowledge including the efficient use of the tide as well as to the establishment of unique haenyeo culture which covers diving suites, tools, folk songs, and shamanic rituals. Haenyeo culture is basically concerned with diving skills that enable women to gather marine products from deep in the sea without the support of any mechanical equipment, it is folk knowledge which has been accumulated through past haenyeo work experience, and the cultural phenomena derived from the sustainability of their livelihood through these means that keeps this heritage alive.