Submarine introduction: The Type 33 submarine is the most important part of the museum. It was the main type of conventional submarine of the People's Navy submarine force in the 1970s. It was mainly used for patrol and warning. The Type 33 submarine was shipped from the East China Sea. It took 3 months to land, with a maximum length of 76.6 meters, a maximum width of 6.7 meters, a maximum height of 12.85 meters, a water displacement of 1,330 tons, and an underwater displacement of 1,730 tons. At present, the construction of this type 33 submarine has been stopped.