The play takes the deep diving of nuclear submarines as the main axis of the narrative, not only showing the thrilling diving scene, but also focusing on the inner world of Huang Xuhua, the founder of China's nuclear submarine and winner of the Order of the Republic, looking back on his outstanding contributions and ups and downs to the development and leapfrog development of China's nuclear submarines for dozens of years, as well as the deep, rich and complex emotional world with his mother and wife. The play reveals that "Deep Sea" is not only the deep sea where nuclear submarines swim, but also the meaning of the deep sea of life and soul melting.