Plot synopsis: "Blue Realm" is the first time that a documentary team in China has comprehensively and systematically filmed the story of the ocean in the form of a nature documentary, and it is also the largest, widest and most comprehensive marine shooting operation in China so far. This film consists of 6 episodes, taking China's offshore as the stage, leading the audience to view the frozen Bohai Bay, the Yellow Sea and the East China Sea with four distinct seasons, and the South China Sea with long summer and no winter, respectively from the seasons, trends, coastal wetlands, islands, bays, survival challenges and other perspectives, telling the story of marine life, presenting a mysterious, magnificent and vibrant blue land.