Operation Hadal or Operation Leviathan (simplified Chinese: 蛟龙行动; traditional Chinese: 蛟龍行動; pinyin: Jiāolóng Xíngdòng; lit. 'Operation Jiaolong') is a 2025 Chinese action war film. It is a follow up to the 2018 film Operation Red Sea. Differ from the previous film's above water action set-pieces, this film is about a nuclear submarine, and feature mainly underwater action. The film was produced by Bona Film Group and directed by Dante Lam, and it stars Huang Xuan, Yu Shi, Zhang Hanyu, and Du Jiang. It was released in China on 29 January 2025 (Chinese New Year).