At present, there are many diving clubs listed by the diving association in Shanghai, but some are too small and some are no longer open. At present, there are three more formal and continuous training institutions: Haishanghang, the one in Shanghai Swimming Pool; Joint scuba diving, training tours and equipment sales are all under way. These two are the oldest, and both are PADI diving centers. There is also a large-scale Youlan diving club, which is relatively new. The coaches of Starfish and Youlan used to be athletes. One is a water polo player and the other is a swimmer. The coach of scuba diving used to be a navy diver. These three coaches have good qualifications, and the navy has the most diving experience. However, the training condition is that the swimming pool is better, with a diving pool of 5 meters, but not every class uses a pool of 5 meters. In terms of price, Youlan takes the high-end market and has the highest price. The price of starfish is similar to that of joint scuba, but the price of starfish is rarely discounted. Self-help or AA scuba diving activities are more frequent in summer than starfish//