This is an oriental "Dunkirk", a documentary film about commemorating the great feat of Chinese fishermen. Filmmaker Fang Li and his crew conducted a detailed historical investigation and tried their best to find the core parties and their descendants from Britain, the United States, Japan and China, trying to get as close as possible to the truth about the sinking of the "Lisbon Maru", the "ship of death" in World War II, 30 meters below the seabed near Dongji Island, Zhoushan, China.