People have long wished to travel to the bottom of the sea. As early as 2,800 years ago, during the heyday of the Mesopotan culture, the army of the Azria Empire used sheepskin bags to inflate air and attack the enemy from the water. This may be the ancestor of diving. In the Chinese history book "Wei Zhi Japanese Biography" 1,700 years ago, there are already descriptions of fishermen diving and fishing in the sea. By 1720, an Englishman used a custom-made wooden barrel to dive to a depth of 20 meters and successfully salvaged it from the seabed.

The predecessor of today's professional diving is the mechanical diving invented by Guo Mengbeixi in the UK 160 years ago to connect a pump to the water and transport air, that is, helmet diving. This type of diving first appeared in Japan in 1854. In 1924, glass was used as diving goggles and a "mask submersible" that used a pump to suck air from the surface of the water was used. This was the predecessor of scuba diving equipment. Just this year, the Japanese used a mask-type submersible to dive 70 meters under the Mediterranean Sea and successfully retrieved gold nuggets from the sunken Yasaka, shocking the world. During World War II, a special military "air cover submersible" was developed, which used a closed-circulation type and an air bottle device. At the end of World War II, France developed an open "air submersible". This type of submersible was very popular in Europe and the United States around 1945. In recent years, the advancement of diving equipment has led to the vigorous development of diving, and more and more people are devoted to diving and enjoy diving. As diving has become popular all over the world, entering the underwater world is no longer a fairy tale wish, but a romance that will surprise you. You don't need to learn diving in advance, you can feel the novelty of diving in real waters. Imagine that when you slowly dive into the cool and clear water, the sunlight is refracted by the water into countless stars, constantly flashing and shining in front of your eyes. When the colorful fish cuddle up close to you, you will happily feel that you are in a wonderful new world and enjoy the colorful underwater creatures; when the strings of bubbles float happily past your ears, you will be surprised. You will find that you are flapping your flippers easily, suspended in the water freely, and truly appreciate the wonder, romance, freedom and happiness of the underwater world.

The benefit of diving is not only the great spiritual enjoyment that the strange world in the water brings to people, but more importantly, it can improve the heart and lung function of the human body. In the United States and Japan, diving is even regarded as a sport. An auxiliary means to treat cancer; according to scientific evidence, the balanced pressure of water on the human body helps blood circulation, and long-term oxygen inhalation underwater can effectively kill cancer cells and inhibit the spread of cancer cells. But because the cost of diving is high, most people cannot afford it. Although the basic training fee is only about 2,000 yuan, the subsequent equipment and travel expenses are not something everyone can afford. A good set of equipment costs RMB 20,000 to RMB 30,000 for ordinary equipment, and more than RMB 100,000 for high-end equipment. If you want to go to good natural sea areas, the nearest ones are Malaysia and Thailand, and the far ones are Australia, the Red Sea, etc. For an object placed in water, the buoyant force it experiences is equal to the weight of the amount of water it displaces. If the weight of the water displaced by an object in the water is greater than the weight of the object itself, the object will float on the water and we say it has positive buoyancy. Otherwise, it sinks, which is called negative buoyancy. If the weight of the water displaced by an object is equal to the weight of the object itself, the object will be suspended in the water and achieve neutral buoyancy.

When diving, it is very important to learn to control buoyancy on the surface and underwater. For example, when you are resting on the water surface, positive buoyancy can save your physical strength. However, when you are at the bottom of the water, you need to maintain neutral buoyancy most of the time to allow you to swim easily and freely in the water, maintain good visibility, and avoid contact with vulnerable people in the water. Creatures take damage.

Divers can adjust the buoyancy through weight, buoyancy adjustment device (BC) and the depth of breathing. Necessary learning for sea diving: including how to use breathing tubes and regulators, resting methods on the surface, handling emergencies, etc. Preparation before entering the water is very important. Check whether the equipment is functioning properly by yourself, and check with each other among your peers. Posture for entering the water: Diving upright from the front - the water depth must be more than 1.5 meters, stand your feet forward and backward, hold the mask with one hand, and press the air tube strap with the other hand. Entering the water while facing away - Sit on the boat facing inwards and enter the water with your back facing forward. Entering the water while sitting on the front - for beginners. Enter the water sideways - then float on the rubber boat and roll into the water. Descent: B.C. (buoyancy regulator) method - use a buoyancy regulator and a weight belt to descend head and feet. No need to use B.C.-head and feet.

Ascent: Control the ascent speed within 18 meters per minute. Simply put, do not exceed the rising speed of the bubbles you exhale; do not stop breathing; when rising, look up at the water surface, you can extend your right hand to specify the direction, pay attention to your back, and slowly rotate your body .

The following patients are not suitable for diving: colds, neuropathy, ear and nose diseases, heart disease, high (low) blood pressure, drunkenness, diabetes, psychological factors, etc. In addition, people who have had thoracic surgery should not dive.

The difference between snorkeling and scuba diving: Scuba diving refers to a diving activity in which divers carry their own underwater breathing systems. For recreational scuba diving, divers use a complete set of scuba diving equipment including a buoyancy adjustment device (BCD), cylinder, regulator, diving suit, mask, diving boots, fins, pressure gauge set (residual pressure gauge, depth gauge , compass), a method of breathing for long periods of time by breathing compressed air in a cylinder. Snorkeling is a method of diving as long as the diver can hold his breath until he surfaces when he can no longer hold his breath.

The rules of scuba diving: the maximum diving depth in the recreational diving field is 40 meters, the limited depth for junior open water divers OW is 18 meters, the advanced open water diver AOW, the theoretical maximum depth is 30 meters, when the diver dives You must stay within the limits of your training experience and dive according to the diving leisure schedule. When diving in unfamiliar waters, you also need a local diving guide (diving guide). The principle of two people traveling together (buddy principle): two people must be together from entering the water to landing; the instructor is not allowed to allow the companion to land on his own; the two people must keep in touch frequently. What to do when you're alone: ??Stay calm, float a few meters up, and look for your companion; if you can't find one, surface and watch for bubbles. If there is still no sign of your companion after more than ten minutes, you should return to the place where you entered the water. Please do not hunt aquatic animals unless necessary. Check the remaining pressure gauge every ten meters. Several common gestures for engineering: the situation is good now---"OK", pay attention to the direction (of the object)--"the index finger indicates the direction", float up--"make a fist with the right hand, thumb up", dive---"make a fist with the right hand" , thumbs down”. Adjust ear pressure: For those who are diving for the first time or who have not been diving for a long time, the pressure of the water can cause discomfort or even pain in the ear canal. At this time, you should hold your nose with your hands and blow air into the nasal cavity with force, so as to increase the air pressure in the ear canal and offset the pressure of the water. If you dive further down, the pain in the ear canal will be unbearable. You should come up immediately and don't show off. Snorkeling

We divide it into activities that only float on the surface without diving into the water, which are called "snorkeling", and diving activities that involve holding your breath while diving into the water are called "breath-hold diving". Snorkeling can be done using only snorkeling equipment (i.e. the three treasures of snorkeling - mask, snorkel, and fins)! Snorkeling is called snorkeling or snorkeling in English (the formal name is Snorkel dive or skin dive).

Air diving

The so-called "air diving" means that the diver can obtain a supply of gas during the dive. It can also be divided into two major categories. One is "self-supplied air diving". Diving" and one is "Air Diving".

The activity of diving into the water where the diver himself carries the gas used during the activity in the water is generally called "scuba diving". Air-supplied diving is when the diver relies on an air supply pipe to transport air from the surface to the diver during underwater activities. It is also called "surface air-supplied diving". In recent years, various famous holiday coastal areas around the world have This surface air diving activity allows tourists to experience the underwater world.

Scuba Diving

In order to dive continuously underwater for a long time, people have to carry cylinders filled with compressed air into the water. This method is scuba diving. .

At this time, the diver is breathing the air in the cylinder. People often mistakenly think that the cylinders carried by divers are oxygen cylinders. In fact, this understanding is incorrect.

Scuba diving allows you to swim as leisurely as you like, but you have to surface before your limited air is used up. Submersibles are divided into: hard diving, soft diving, semi-locked circuit air supply type, air supply type on demand, and self-supply air type.

Divided by diving method: non-saturated diving, saturation diving; classified by breathing gas type: air diving, nitrogen, oxygen mixed gas (artificial air diving), helium, oxygen mixed gas (artificial air diving) , hydrogen, oxygen mixed gas (artificial air diving), other mixed gases.

Diving activities are divided into professional diving and recreational diving in nature.

Professional diving mainly refers to diving activities that require experienced professional divers in underwater engineering, underwater rescue, underwater exploration and other aspects. Recreational diving refers to diving activities for the purpose of underwater sightseeing and leisure entertainment, which is divided into snorkeling and scuba diving. (That is, diving with air cylinders and underwater breathing apparatus.) The diving sightseeing we usually come into contact with is recreational diving, and the vast majority of what we see in seaside tourist attractions is the diving experience in recreational diving.

Snorkeling is relatively simple. You only need to use a mask, snorkel and fins to float on the water, and then watch the underwater scenery through the mask. Snorkeling activities can be carried out at home and abroad as long as you pass simple training and do not necessarily need to obtain a snorkeling certificate.

Scuba diving involves carrying compressed air bottles (not oxygen bottles as many people think) and using underwater breathing apparatus to breathe underwater. It is a true type of diving into the water. A complete set of scuba diving equipment includes masks, snorkels, fins, respirators, diving instruments, air bottles, buoyancy adjustment vests and diving suits. When diving in open water, divers also carry diving knives, underwater flashlights and even spearguns. Wait for necessary auxiliary equipment. 1. 〖Definition of free diving〗

What is free diving? Free diving is diving as deep as possible into the ocean without a tank, like a fish. For many, "AIDA" is an opera by Verdi, with a performance by a diva with incredible lung capacity, while for others, "AIDA" is an organization (Association Internationale pour le Developpement de l'Apnee), an organization of freedivers.

2. [Characteristics of free diving]

Extreme sports such as rock climbing and bungee jumping are not as challenging and dangerous as free diving. In fact, this sport has an ancient history. A long time ago, people dived into the seabed to find food and treasures. Italian diver Marbetto Pizzelli said: "Free diving is entering another world, without gravity, color, and sound. It is a long jump into the soul."

3. Pizzilli Diving experience〗

In October 1999, Pizzri dived to a depth of 150 meters. He dived and returned in one breath. He extended the record held by compatriot Giovanni by 12 meters. In January 2000, Cuban Francisco Ferreira set a new record of 162 meters in the Gulf of Mexico in 3 minutes and 12 seconds. The day he dived was his 38th birthday.

Pilizri is now 34 years old. When he was a child, he was afraid of water and would not take a shower. But he can now hold his breath in the water for 7 minutes and 2 seconds (the record is 7 minutes and 35 seconds held by Frenchman Andy Le Sauce), and although this shows that his lungs are different from ordinary people, Pizzri said : "What's more important is whether your ears can withstand the pressure of deep water, your muscles and your mental preparation. Your muscle fibers should be thin and long, so that less oxygen is consumed, and you have to eliminate fear and worry."< /p>

4. "Records of Free Diving"

The purest type of free diving is called "constant weight" diving, which means that the diver maintains his or her own gravity when diving and coming up. Correspondingly, it is called "unrestricted diving". The diver uses a gravity device when diving and a buoyancy device when coming up. Of course, both dives require a guide carrying a tank. Pizzri's record for "constant weight" diving is 80 meters. The Guinness record for the deepest human deep sea dive is held by Ahmed Gabr. His world record is 1090 feet 4 inches. (approximately 332.25 meters).

5. 〖Tanya Stout〗

Tony Stout, the best female free diver in the world, also lives in Hawaii. She holds the women's "constant weight" diving record of 67 meters and the "unlimited" diving record of 113 meters, which is the first-class level of men's free diving in the world. In the "free immersion" method, she is the world champion with a score of 55 meters, which is 3 meters deeper than the men's world best. This method requires divers to only use the power of their arms instead of fins.

Stuite believes that there is no physical reason why women cannot dive as deep as men, but women feel pain more intensely and feel their limits faster.

She hopes to improve her "infinite diving" record to 122 meters. Completing such a dive will cost about $35,000, including a boat, training, referees, safety guides and equipment. All freedivers require special ear protection against water pressure. During the dive, their heartbeats drop to 10 beats per minute and their lungs shrink to 1/6 of normal size.

〖Words from AIDA Headquarters and its Chairman〗

AIDA is headquartered in Lausanne. Chairman Saberstein Nagel said there are an estimated 5,000 freedivers worldwide, distributed in 40 countries. nation. Nagel said: "Those who want to dive should keep two things in mind. One is not to train alone, and the other is not to train with inexperienced people. The safest training method for free diving is to train without water, even for champions. The best training. "Yes, the most common training methods for freedivers are yoga, long-distance running and gymnastics. Engineering diving mainly refers to underwater engineering operations such as rivers, lakes, seas, and reservoirs. Nowadays, engineering diving mainly serves offshore oil production projects (offshore). General technical tools include underwater video equipment, underwater welding and cutting equipment, light and heavy diving equipment, underwater concrete splitting equipment, etc. Diving technicians are required to obtain professional qualification certificates, diving operation experience, and have certain requirements for the depth of underwater operations. .

The scope includes underwater operations in dock and bridge construction, reservoir and dam inspection and repair, underwater inspection and repair of ship hulls and docks, underwater welding and cutting, underwater salvage and debris removal, and underwater pipeline laying. Underwater video recording, etc. Provide services to various owners and construction units such as ports, bridges, shipyards, power plants, reservoirs, etc.

Due to the long operation time, high intensity and high safety requirements, engineering diving (also known as commercial diving) generally adopts the form of surface pipe supply. Tube-supplied diving means that the diver breathes gas supplied from the surface gas storage device to the underwater through the umbilical air tube. Compared with SCUBA (Self Contained Underwater Breathing Apparatus) diving commonly used in recreational diving, it has a large air supply capacity, long operation time, and can be used in emergency situations. Water surface recycling and other advantages.

Due to the anesthetic effect of nitrogen, my country stipulates that diving with air or nitrogen-oxygen mixture cannot exceed 60m (international regulations are generally 50m). For deeper dives, helium is generally used instead of nitrogen as the neutral breathing gas. Hydrogen-oxygen mixtures are not used due to safety and other reasons.

Generally speaking, the depth of heliox diving can reach about 100m. Reaching deeper depths requires a long underwater decompression time and is unsafe during underwater decompression, so it is not allowed to be used. use. Heliox diving generally uses an open bell or closed bell diving equipment system.

To reach deeper depths, the technique of saturation diving must be used. Commercial saturation diving has been compared to saturation diving, and all above dives are non-saturation diving. The so-called saturation diving means that the time a person stays underwater exceeds a certain limit, so that the breathing gas of the human body under the depth pressure is fully dissolved in the human body, reaching a gas partial pressure balance. This enables people to overcome decompression sickness (see the prevention and treatment of decompression sickness in diving) and work and live underwater and in living chambers with considerable underwater pressure for dozens of days or even longer.

Saturation Diving China’s first autonomous saturation dive was completed by the Shanghai Salvage Bureau of the Ministry of Transport on December 30, 2006.

For safety precautions in engineering diving (commercial diving), please refer to the national standards "Safety Requirements for Air Diving" and "Safety Requirements for Mixed Gas Diving".

For precautions when flying in an aircraft after diving, please refer to the transportation industry standard "Requirements for Divers to Fly After Diving." Due to the growing popularity of diving, many diving organizations have emerged. There are hundreds of diving organizations in the world. Due to differences in business strategies and methods, their popularity, popularity, and degree of internationalization vary. Here are some well-known international diving organizations.

Recreational Diving Organization

PADI (Professional Association of Diving Instructors) was established in 1966, and its education system has spread throughout the world. PADI focuses on developing and designing scuba diving training courses and training materials, maintaining and recording the information of each level of divers in detail, and hopes to establish a globally credible diver qualification certification system.

NAUI (Association of Aquatic Instructors International) was founded in 1960, and its education system has spread throughout the world. NAUI is composed of many members, including: dive masters, assistant instructors, snorkeling instructors, and diving instructors. NAUI stands for "Quality of Training", "Coaching Ability" and "Diving Safety through Education".

CMAS (World Aquatic Federation) was founded in 1958. Its education system is popularized in all regions of the world; most diving organizations and CMAS cross-certify diver qualifications and levels. A small number of diving organizations are members of the CMAS "Technical Committee". CMAS has established three committees. The "Sports Committee" is responsible for coordinating member states and governments to establish international competition rules for fishing, fin swimming, water polo, water hockey, etc. The "Technical Committee" is responsible for formulating "standardized" scuba diving training rules and international certification systems; it is also responsible for promoting and improving the research and development of high-tech materials and diving equipment related to scuba diving safety. The "Scientific Committee" provides funds to implement research projects related to "Diving Technology".

The YMCA (Youth Christian Association) was founded in 1959. Its education system is popularized in North America, Central America, Southern Europe, and Northeast Asia. Based on the CNCA (National Council for the Advancement of Aquatics) "Water Breathing Apparatus Development Guidelines", a high-standard safe diving training course, referred to as "Y-SCUBA", has been developed. In 1990, the YMCA provided a full scholarship for the diving instructor course at Ball State University in Muncie, Indiana, USA.

ADS (International Alliance of Diving Schools) was established in 1980. Its education system is spread across the Pacific Island Arc region from Japan to Taiwan to Palau. Its purpose is to instill correct diving knowledge and skills and the concept of safe diving. It is a specialized school for diving education.

BSAC (British Diving Association) was founded in 1953. Its education system is popularized in the British Association countries, Europe, and Northeast Asia. Its nature is similar to that of a consortium, and the profits gained from the organization's operations must be used for research and development in diving safety to benefit diving enthusiasts. BSAC developed rapidly in the UK from 1954 to 1955 and became the authoritative organization for policy guidance on water sports in the UK. It also established the "BSAC Diving Training School System" in 1976. "

BSAC Diving School: It is an independent business group authorized by BSAC to train and award BSAC diving qualifications.

Technical Diving Organization

PSA (Professional Scuba Diving Series) was established in 1987. Its education system is popularized in North America. PSA uses the knowledge and skills originally derived from "air scuba" technical diving. Experience, develop strict safety guidelines, provide appropriate technical diving training, and extend the diving field of recreational divers in the safest way.

TDI (Technical Diver International) was established in 1994 and its education system has become popular. The regions are North America, South America, Europe, Central Asia, North Asia, and the Middle East. TDI's core management personnel have more than 20 years of experience in the field of technical diving: TDI develops a wide range of technical diving training courses and uses many supporting teaching materials. At popular prices, we provide education and training on NITROX, Mixed gas, Deep air, etc. in the field of technical diving.

IANTD (International Association of Nitrox Diving and Technical Divers) was established in 1985. Its education system. Popular areas are North America, the United Kingdom, Europe, Africa, and Asia. IANTD develops high-quality "standards and procedures" to regulate EANx education and training. In 1992, IANTD began to compile systematic technical diving related teaching materials, including: training manuals for divers at all levels. , various technical diving reference tables (PO2.CNS/OUT%, EAD, heilium, EANx)

ANDI (American Nitrox Diver International) was established in 1989, and its education system has spread throughout the region. For North America, Europe, the Middle East, and North Asia.

ANDI was originally called the "American Nitrox Diver Association". Its goal was to promote the standard formulation and education training of "nitrox" breathing gases, so that divers in the recreational diving field can safely operate under the correct guidance of technical diving instructors. The application has been developed for more than 40 years and has undergone rigorous testing by the US Navy and NOAA. The EANx (NITROX) diving breathing gas developed by the US Navy is used for diving activities. ANDI formulates the preparation procedures and inspection standards for respiratory EANx gas, and registers the trademark "SafeAirTM". The EANx respiratory gas produced in accordance with ANDI specifications is called "SafeAir". Cramps:

Camps may occur if you are stressed, if the water is too cold, or if you stay in the water for too long. Preparatory activities before entering the water should be sufficient, and the time in the water should not be too long. If cramps occur, don't panic. For example, if your toes are cramped, then immediately bend your legs and use force to spread and straighten your toes; if your calf is cramped, take a deep breath, lie on your back on the water, hold your toes with your hands, and push your calves forward with force. Let the contracted muscles stretch and relax; when your fingers cramp, make your hands into fists, and then open them with force. Repeat this to relieve yourself.

Dizziness and brain swelling:

The main reason is that the diving time is too long, blood accumulates in the lower limbs, cerebral ischemia, and the body's energy consumption is large and the body is overtired. Go ashore immediately to rest, keep your whole body warm, and drink some light sugar and salt water.

Nausea and vomiting:

This happens when dirty water is choked into the nose. Go ashore quickly, and then press the Zhongwan and Neiguan points with your fingers. If there is a Rendan, you can also hold one in your mouth. To prevent enteritis, you can also eat a few cloves of raw garlic.

Itchy skin and rash:

Mainly caused by skin allergies. Go ashore immediately. Take a piece of astamine or chlorpheniramine and you'll be better soon.

Itchy eyes:

It may be caused by unclean water. Immediately after landing, rinse your eyes with clean light salt water, and then apply chloramphenicol or erythromycin eye drops. It is best to apply a hot compress before going to bed.

Headache:

The cause may be chronic rhinitis, choking on water or body cold, or temporary cerebral vasospasm causing insufficient blood supply. At this time, you should go ashore quickly, use your thumbs to massage the Baihui, Taiyang and Lieque points on the top of your head, then apply a hot towel on your head, and then drink a cup of hot water to get better.

Abdominal pain and bloating:

Abdominal pain and bloating will occur just after eating or diving on an empty stomach. At this time, you should go ashore and lie on your back, press the middle courtyard, upper courtyard or Zusanli with the tip of your big toe, take 3 to 5 ml of ten drops of water orally, and apply a hot hand towel to the abdomen.

Earache and tinnitus:

It may be caused by water in the ears or water in the nose. The drainage methods are:

① Tilt your head towards the part where the water is in the ears. side, pull the earlobe firmly, and jump on one foot with the leg on the same side.

② Aim the palm of your hand at the ear canal and press the ear tightly with your hand. If there is water in your left ear, tilt your head to the left, and then quickly pull your hand away, and the water will be sucked out.

③ Use a sterile cotton swab to put into the ear canal to suck out the water.

Notes on diving

1. Maintain communication During the diving process, communication with divers and companions must be done well. Effective communication better guarantees the diving process. In foreign countries, not all divers follow the simple one-to-one or one-to-two model. In some popular diving spots, one person often leads more than a dozen people to dive. Therefore, the rules of the team must be strictly followed, even if there is an emergency underwater. You can also find solutions in time.

2. Do not go alone when diving in unfamiliar waters. Do not go alone when diving in unfamiliar waters. Because you do not understand the sea area, there may be many hidden dangers. If you go alone, it is easy to have irreversible consequences. At the same time, if you are at the bottom of the water with your companions and suddenly find that your companions are missing, you are generally only allowed to wait under the water or search for one minute before leaving.

3. Don’t touch them casually. When you see the sea turtles facing you on the seabed, you may want to get up close. Groups of corals and cute tropical fish will also make you curious. You have to reach out and touch, but such behavior is basically not allowed. Destroying the environment and harmony of this sea area, you may not be able to see these magical species next time you come back.

⒋. Other things: First, stick to the principle of two people walking together and follow the leader closely. The second is to wear a life jacket. Third, the weight belt is worn last. Fourth, don’t use earplugs.

The fifth is to remove the water in the mask. Sixth, don’t do super-breathing movements. Seventh, remove the fins, mask, and breathing tube after you are completely out of the water and ashore.

How to achieve ear pressure balance

1. Pinch the nose and blow air. Ear pressure balance refers to the technique of making the pressure in the ear equal to the surrounding environmental pressure in a certain way. The most commonly used method is pinching the nose and blowing air, pinching the nose to block the nostrils, and then gently blowing out the air through the nose. At this time, you will feel the eardrum bulging outward and make a clicking sound.

2. In addition to pinching the nose and blowing air, other methods can also be used to balance ear pressure by swallowing saliva, yawning or swinging the mandible left and right.

3. Precautions: First, start equalizing your ear pressure before diving; second, do it every few meters after diving to avoid discomfort; third, do not wait until you feel uncomfortable (or Remember to start doing it only when you feel pain); fourth, if the ear pressure cannot be raised, increase it a little and try again. If you still cannot balance the ear pressure after all your efforts, give up diving; fifth, never hold your nose and inflate too hard for too long, otherwise the cochlea and eardrum may be damaged.

4. Drainage in the ear. If you have earache or tinnitus after diving, it may be because the ear is filled with water or the nose is choked with water. The drainage method: first, tilt your head to the side of the ear where the water is entering, and pull it hard To touch the earlobe, use the leg on the same side to jump on one foot; second, align the palm of your hand with the ear canal, block the ear tightly with your hand, and tilt your head to the left when water enters the left ear, and then quickly remove your hand.

Posture for diving into the water

1. Diving upright from the front to a depth of more than 1.5 meters, with the front tongue of both feet open, holding the mask with one hand, and pressing the air tank strap with the other.

2. Enter the water with your back facing forward and sit on the side of the boat, facing backward into the water. Entering the water in a sitting position, suitable for beginners.

3. Enter the water sideways, lie prone on the rubber boat and roll into the water.

4. Use a buoyancy regulator for descent, and cooperate with the weight belt to descend head and feet.

5. When ascending, control the ascending speed within 18 meters per minute. Simply put, do not exceed the rising speed of the bubbles you exhale; do not stop breathing; when ascending, look up at the water surface and you can extend your right hand to specify Direction, pay attention to your back, and slowly rotate your body.

What are the benefits of diving?

1. The wonderful feeling

The recreational diving that people yearn for is to enter a complete world in a state similar to weightlessness. Different spaces allow people to completely relax their body and mind, let everything be casual and natural, and silently watch various colorful and exotic corals and fish on the quiet seabed. Communicate with peers using gestures and eyes. This feeling cannot be obtained on land, nor can anyone who has not truly dived into the seabed experience it physically.

2. Physical exercise

Diving can increase lung capacity, enhance the strength of major muscle groups, improve swimming skills, exercise physical fitness, and even have the effect of losing weight.

3. Acquisition of knowledge

In addition to mastering a lot of physical, physiological and medical knowledge about diving and marine life knowledge, you can also learn first aid, drowning rescue and other knowledge.

4. Fitness and beauty

Since diving breathing is compressed air, oxygen molecules can better penetrate into the skin through the flow of blood, speeding up the metabolism of the skin, thereby achieving Skin beautification effect; since people consume more heat energy in water than on land, diving has also become a good way to lose weight and keep fit.

5. Tempering of will

Diving can also temper will and cultivate team spirit. Diving can exercise people's psychological quality, let people learn how to face unfamiliar environments, and enhance their ability to deal with crises and emergencies. No matter how high their level is, divers and diving instructors must strictly abide by the buddy system. They cannot dive alone. Dive buddies must take care of and help each other.