The Lushun Submarine Museum is the first time to visit the interior of the decommissioned 303 submarine. The staff opened two doors on the side of the submarine. They passed through the crowded interior of the submarine as import and export. They saw the compact installation of various instruments and dials in the hull. They felt that they worked in such an environment, not only the space was crowded, but also the conditions were harsh. They slept. It's a hammock. It's about 50 centimeters wide. People who are slightly fatter can't lie down at all. It's hard to imagine. Next is a simulated cruise show. We gathered in a room with a simulated platform in front of us. The crew took us "deep" to the bottom of the sea and "sailing" to the "cruise" exercise "sinking" near Diaoyu Island and two "enemy ships". The form is very novel, but also has the implication of science and education, or quite innovative journey, is a good place for enthusiasts to popularize science.