On this day, 36 years ago, on October 9, 1989 (September 10, 1989, the lunar calendar), my country's first submersible yacht was launched. On October 1989, my country's first submersible yacht integrating entertainment and science popularization was successfully trial-produced at the Hanshou County Shipbuilding Plant and was launched for trial sailing a few days ago. This submersible yacht is a kind of amusement equipment suitable for park reservoirs, inner lakes and other waters. It can sail on the water or dive into the water. The ship can carry 4 people and the maximum speed is 5 kilometers per hour.