Synopsis："Boundless Sea" is adapted from Pan Haigen's popular novel of the same name. It is China's first marine adventure series IP and the first IP project to showcase the mysterious waterborne life of the "sea salvagers," the Tanka people. Centered on treasure hunting and exploration, the film blends elements of sailing, adventure, and sea monsters, revolving around the mystery of an underwater city. It follows the descendants of the Tanka, Bian Haisheng, and An Su, the daughter of the island lord of Lingyao Island, as they embark on a sea expedition and encounter various wonders while delving into the secrets of the underwater city.