Free diving daka
Wang Aolin, Jessea Lu Jessie, Copper Canyon Enzo, Sura, Dada Lida,
Representative of the free diving community in China.
SSISSI has provided training, scuba diving certification and educational resources for divers, diving instructors, diving centers and resorts all over the world for more than 45 years. Starting from 1970, SSI has been expanded to 30.
There are many service centers in 1 10 countries and more than 2,800 international regions, with teaching materials in more than 30 languages.
The different levels of SSI free diving are as follows:
Basic free diver
Free diver in swimming pool
First-class free diver
Second-class free diver
Three-level free diver
SSI first-class free diving instructor
Level 2 free diving instructor
Three-level free diving instructor
A teach who specializes in free dive.
Coach training officer
In addition, all English textbooks and teaching standards of SSI free diving were compiled by LottaEricson, a former world free diving champion.
Free diving, which requires attention, will lead to decompression sickness (DCS). General 10, 20 meters players will also encounter decompression problems. Don't doubt that this is a personal problem that you and I should attach great importance to!
The decompression symptoms caused by free diving have a scientific name: TARAVANA, the origin of the scientific name, which is the name of a small island in Polynesia. Local celebrities habitually dive to the bottom of the sea to find food or pearls. Because they often dive, collective diving diseases often occur for a long time, which has attracted the attention of many diving medical experts. Because the island residents are used to diving by hand, this kind of diving was originally thought not to cause decompression symptoms. After research, I found that this is not the case, freedom. The indigenous people in Tarawana usually dive to the bottom of the sea 30 to 42 meters deep. The total diving time is about 100 second, the water rest time is about four to six minutes, and the total number of dives a day is about 40 to 60 times. They generally rely on heavy objects such as lead blocks to dive, and the way of ascending will pull the guide rope in advance. In other words, they may do less exercise when diving than we do (the more exercise, the easier it is to cause decompression sickness), and there are usually assistants on the water to help them collect food. Under this diving mode, the local aborigines have obvious decompression symptoms: limb paralysis, brain injury, headache, decreased vision, hearing loss, spinal diseases, and some of them die or live with irreversible sequelae.