A scientist passionate about extreme sports, Li Qiang, faces off against a ruthless predator at the top of the ocean's food chain in a life-and-death game. Beneath the ominous clouds, danger lurks just beneath the surface.

In the early days of the founding of the People's Republic of China in 1949, New China was faced with "internal and external troubles". Since the outbreak of the Korean Civil War, the U.S. military has repeatedly provoked the border between China and North Korea, and civilians have been brutally bombed. In order to maintain the hard-won peace and long-term stability for generations, in October 1950, the Chinese People's Volunteers entered North Korea, and the "Resist US Aid Korea" war kicked off.