Second, look for shallow water (at least not higher than your chest). Don't rush into deep water at this time. You should study in shallow water for at least a week to adapt to the floating effect and shallow diving (try to immerse your head in the water and master the time limit for diving in one breath). True transparency is to immerse your head in the water in shallow water and count silently to see how long you can hold on. Repeat this practice for a period of time until you are no longer afraid of soaking your head and hold your breath for a long time before considering further work. The average person's diving time should be 45 seconds to 60 seconds, which means that the average person's diving time and depth must be controlled within 45 seconds to 60 seconds from diving to water. Otherwise, you will be in danger of suffocation and drowning.
Thirdly, when I have this diving experience, I will take the next step, find a suitable coach to guide synchronized swimming, and go into the water as high as people to learn to tread water, breaststroke, backstroke, dive and tread water.