On the national day of 2015, a number of diving accidents occurred in the accommodation of ships in Galapagos, Ecuador, Comodo, Indonesia and the Red Sea, Egypt.

While sighing deeply for these divers, I also hope to learn valuable lessons from the accident report.

Many people are curious about the unknown underwater world, but if you want to explore the unknown underwater area, the first thing to do is to learn to dive. So, what are the precautions for diving?

Diving should first consider safety. It is very dangerous for ordinary people to try diving without learning. However, by learning theoretical knowledge, practicing in the swimming pool and calm waters, and remembering and abiding by the important principles and regulations of diving, it will be much safer to dive.

There was a dangerous sports ranking on the Internet. Football ranked first and diving ranked 43rd; Some diving related organizations have given more professional data analysis. According to the British HSE data in 2001, the mortality rate of leisure diving is 1.63 per 10000. Of course, this is an earlier data. As the sport becomes more and more mature, this proportion has decreased so far. Then there is the official statistics of PADI. The average number of graduates is about 500000 times a year, and the number of deaths in the process of learning is between 10 and 20.

Summer diving is the only choice for many young people. It can not only exercise, but also contact with underwater creatures. It is very meaningful, but diving is some risks after all. So, what are the precautions for diving? Baibai safety net, let's go and have a look with you!

The reason why we want to learn diving is to improve the safety factor, minimize the anxiety factors and ensure the smooth completion of each diving.

What are the usual dangers of diving?

I divide it into two parts (other coaches will also have their own views, welcome to discuss and supplement). One part is their own danger and the other part is external danger.

Potential factors of self danger include

Cognition of diving and ocean, physical condition, psychological condition, water nature, diet, personal equipment and personal underwater behavior. The above factors can be grasped, adjusted and changed by ourselves.

Potential factors of external hazards include

Diving point environment, diving vehicle, diving companion, diving guide, other unforeseen factors. One by one,

Physical condition: whether there are physical diseases that are not suitable for diving, whether the physical ability is enough to successfully complete diving, and whether there are congenital symptoms that are not suitable for diving. Nearly 25% of accidents are due to physical conditions.

Psychological status: whether they are afraid of water, suffer from severe claustrophobia, whether they are too nervous underwater, whether they speculate about unknown things and expand their fear, whether they are easy to be careless, whether they are blindly confident and arrogant, whether they have self-discipline, whether they are overly dependent on others, and whether they are strong enough. Nearly 5% of accidents are caused by panic.

Wateriness: there is no doubt that under the premise of not being too arrogant, the better the wateriness, the easier it is to learn diving, and the higher the safety factor.

Diet: first, don't get food poisoning. Second, friends who are prone to seasickness should pay more attention to eating to avoid excessive vomiting. Third, alcohol abuse is prohibited during diving (small drinks are pleasant, and heavy drinking hurts the body).

Personal equipment: have you carefully checked each piece of equipment of yourself and potential partners before launching to ensure that it is within the valid service life and can be used normally. Nearly 10% of accidents are due to equipment failure.

Personal underwater behavior: whether to strictly follow the diving principles, whether to develop good diving habits, whether to have the corresponding diving technology that can cope with the environment, blind exploration, unprovoked provocation to dangerous marine organisms, whether to play with ignorance and excessive jokes underwater. Nearly 40% of accidents are due to personal behavior.

Underwater, nothing is more important than your own life!

Diving is for fun, just for fun. Why make fun of your life?!

The limits of each level of diving are filled out with human life. Don't always care.

The reason why 18m is the limit of ow is that novices are not proficient in neutral buoyancy and various skills. Uncontrolled rise and tension may lead to continuous inspiratory rise. The pressure is small and the rising distance is short. It is possible that the extreme expansion of lungs, injury and decompression sickness are not fatal.

18m / min is also the speed at which bubbles increase. Keep this relatively safe speed (follow the last smallest bubble of exhaled air and don't exceed it), keep the respiratory tract open, and you can still safely go up to the water surface.

Why is 30 meters the AOW limit? Why is 40m the limit of leisure diving?

That's because the equipment and training used in leisure diving are not enough to ensure their safety under more than the limited depth and pressure.

12L single bottle is filled with 200bar and only 2400l air, which is not enough to support diving and decompression rise below 40m. More nitrogen will be accumulated in the body at a large depth.

The technical diving system used to have a large air depth of 55 meters, but iantd doesn't do this training now. Although the oxygen exposure time of a single diving with 1.4 oxygen partial pressure is 150 minutes, it also involves decompression.

Insufficient gas volume, incomprehensible decompression theory, problems of leisure diving equipment may occur at a large depth (pipe explosion, valve damage, airbag rupture, etc.), no emergency training at a large depth, no experience of touching the flow, etc. lifting water is to kick up desperately.

Therefore, those who are 5 or 60 meters under the air of a single bottle are either ignorant or seek death! These people are actually proud of this. They are always challenging the rules and doing inappropriate diving with inappropriate equipment and training.

Colombo in the Philippines takes ow to drill the sunken ship, and Sipadan in Malaysia takes ow to drill the turtle hole... These are the fearless behaviors of ignorant people, which makes these novices don't take safety seriously at all. Therefore, it's not surprising that some ow spend money to encourage sneakers to go deep at night.

Do you have to wait until something happens?!

Like the ocean, but we must fear the ocean. Diving, an accident can be fatal, but for relatives and friends, it is a lifetime of pain!