The story mainly tells the story of Wu Qin (played by Jordan Chan), a descendant of the Sea Hunter Army, and Liuli (played by Wang Yiyao), Du Changfeng (played by Zhao Tingyu), and Long Xin (played by Zhang Xueqi), who form the Sea Hunter Group and go to the Guixu Secret Realm to explore the mystery of immortality. In the film, in order to find the Guixu Stone that can "revive the dead and turn bones into flesh", everyone embarks on a dangerous adventure. Another mysterious organization is also ready to move. In order to compete for the ultimate treasure, the two sides are constantly fighting. In front of the Sea Hunter Group, there is not only the danger of the underwater tomb, but also the ulterior motives of the internal personnel. Can they successfully reveal the secret of the Guixu Stone? Who will be the winner in the contest between the two sides?