How to overcome buoyancy in freediving, how to not float when diving

Due to its own volume, the density of the water in the water has not changed, and the buoyancy has not changed, buoyancy = the weight of the water discharged.

Normal people have always had gravity greater than buoyancy in the water, and if they don't paddle, they will naturally sink without inhaling.

Weight-bearing diving is just about speeding up the dive.

But at the depths of the water, the water pressure increases dramatically, and the body will reimburse you if you don't do enough to do it.

William Trubridge will wear a weight ring around his neck when diving vertically, but there will be a certain amount of positive buoyancy when he is on the surface, and when he dives to a certain depth by kicking his legs, it will become negative buoyancy because the chest and lungs are compressed and the volume becomes smaller, so when he rises from a depth of 100 meters, he must rely on his legs to climb by pushing his legs, and when he rises to a certain height, the lungs gradually expand and become more buoyant, and finally become positive buoyancy.

The purest type of freediving is called "constant weight" diving, which refers to the diver keeping his or her own gravity unchanged when diving and floating, and the corresponding is called "unlimited diving", in which the diver descends with the help of a gravity device and floats up with the help of a buoyancy device.

Therefore, the diving suit for deep diving needs to be attached to the gravity device and the buoyancy device, and the diving device is turned off by the buoyancy device and the buoyancy is overcome by the body, the diving suit, the gas cylinder and the gravity device (adjustable). Of course, the wetsuit has the functions of waterproof, impermeable, heat insulation, and decompression. At a certain depth underwater, the buoyancy and pressure on the human body can be calculated.

If you want to dive without floating, you need to cooperate with all parts of your body and pay attention to your body posture. First of all, the torso and head should be kept at a level position, and the arms should be slightly lower than the head when paddling. This can effectively prevent the body from floating during diving.

Don't neglect the movement of your legs, as they can be separated to the sides when diving. When the arms are diving, the distance between the palms of the two hands is slightly larger, and the direction of rotation of the palms is completely perpendicular to the water surface, which will also help to float without snorkeling. For arm transfers, it is recommended to rotate both hands outward from both sides of the thighs.

When the abdomen and chest are stretched forward under the head, the palm of the hand begins to rotate inward, and then when the palm of the palm is turned downward, it is straightened in front of the head and ready to stroke.

Therefore, if you want to keep your body from floating, you must not only cooperate with the whole body, but also be careful in terms of technique. As a simple example, when the arms and legs are combined, the legs should be naturally straightened and brought together, and the legs need to be tucked in.

The so-called diving is naturally to dive to the bottom of the water to be considered diving, but we all know that water has buoyancy, and everyone will float, so how to control your body in the water to dive and float? Are there any tips for quiet spring and how should they be carried out? Let's learn together.

1. Diving should be kept in a stable state before diving

In the process of diving down, you should exhale slowly, maintain a relatively stable state, and do not have drastic movements, so that you will dive down slowly, if you can't go down, you should consider whether the counterweight is too light.

2. Diving should keep both hands and feet still and expel the stuck air before diving

Hold your hands and feet still: Pull your flippers up close to your hips and hold your knees with your hands so that your hands and feet stay still. Or clamp your arms close to your body with your toes pointing down to reduce resistance.

Drain the stuck air: Raise the charge and exhaust valve as high as possible with your left hand so that the wrinkled tube can be fully extended, and at the same time use your right hand to squeeze the BCD to expel the stuck air. When you open the exhaust valve, lean back as if you were lying on a lazy recliner, which will allow the air bubbles to move towards the exhaust valve and expel them.

3. Diving should be exhaled as much as possible before diving

When you decide you want to dive, exhale as much as you can and don't start inhaling until you've sunk to a depth of 1 or 2 meters. Hold your first breath in your mouth until you go a few more meters before you start breathing normally.

It's not uncommon for you to find a small amount of fluid in your regulator and snorkel, especially after draining. That's not a problem – use airway control to avoid choking by accidentally sucking water down your throat.

1. If water enters the regulator, breathing tube or mouth, remember to inhale slowly to avoid water being sucked into the throat.

2. After draining the stagnant water in the breathing tube and regulator, you should inhale carefully and slowly.

3. When water enters the mouth, put the tongue on the roof of the mouth, like a water baffle. Looking down slightly will leave the water in the secondary head without entering the mouth. Avoid water, breathe slowly, and exhale vigorously to get the water out of your mouth.

If you accidentally inhale some water, it can lead to choking and coughing. Don't worry, it's the body's natural response to expel water from the lungs. At this point, stay calm, hold the breathing tube or regulator firmly with one hand, and cough out of the mouthpiece.

Coughing can also help you clear the fluid from your breathing tube or regulator, so you're addressing both at once. Swallowing water can also help you stop coughing, regain breathing and maintain airway control. With some experience, airway control becomes a natural habit.

Freediving has been called the second most dangerous sport in the world by Forbes magazine, after skydiving. Freediving is undoubtedly very dangerous, and drowning is one of the risks. When a diver descends, the sea puts a lot of pressure on their lungs, and some people even experience what is known as a "shallow water fainting", losing consciousness as they approach the surface during the ascent.

It's a physically demanding sport, but it's also very demanding on personal attention, and you have to put all your thoughts out of it and dedicate yourself to diving.

When diving, the body's capillaries constrict, blocking the flow of blood from the heart to the ends of the body, leaving more oxygen and blood in the heart and brain. As you approach the water's surface, the capillaries begin to dilate again and blood begins to flow from the brain to the limbs. In this process, the lack of oxygen to the brain can easily cause fainting.

Fainting in shallow water is only a temporary loss of consciousness and does not have a lasting negative impact on the diver's health, and if it happens too often, it can become a habitual reaction. When the brain is deprived of oxygen, the body's natural response to active shock occurs in order to conserve oxygen. It's dangerous if it happens on your first solo dive – fainting itself is not dangerous, but unconsciously facing the ground underwater can lead to drowning, so it's best to dive with an experienced companion.

From 30 meters underwater, fainting is a potentially fatal factor.

The main symptom is LMC (loss of autonomic control).

BO (loss of consciousness): webbed, dynamic, DYN (race swim distance), webless dynamic DNF (race swim distance).

Static apnea STA (Race Breath Hold Time) Constant Weight Finned CWT (Race Dive Depth) Constant Weight Fin CNF (Race Dive Depth).

Rope Climbing Diving FIM (Race Dive Depth).

Variable counterweight VWT (Race Dive Depth).

Unlimited NLT (Race Dive Depth).

Note: The so-called constant quantity means that the counterweight used before the dive and during the ascent is kept constant.

When diving, I will encounter the problem of diving buoyancy, so how do we control it when facing buoyancy? In fact, you only need to master a few skills, if you are now facing the problem of diving buoyancy, then come here to find out!

1. Adjust your counterweight every time you dive in a different place

The buoyancy of the sea water varies slightly depending on the salt concentration in each place. Plus wearing maybe a different piece of equipment. Therefore, take a conservative value so as not to sweep away the interest of diving.

The usual practice is 1 kg more than the last dive. When checkdive, you can feel whether the buoyancy is enough.

2. Adjust the buoyancy of the BCD, and do it every time you dive

Adjust slowly with a dot-filled blind world, if you have to fill a lot of air in the water, it means that the counterweight is too heavy.

3. The control of air in the lungs is also the least understood place for beginners

I'm here to tell you that it's not that hard. Otherwise, inhale - buoyancy becomes greater - rise, exhale - buoyancy becomes less buoyancy - fall.

It's just that there is a slight delay in the time of the buoyancy change in the water, maybe 1 or 2 seconds. So beginners who are breathing hard don't feel anything happening at all. Therefore, it is necessary to breathe slowly and exhale slowly to effectively control buoyancy.

1. Ways to speed up the dive

BCD light up the air, exhale and spit until there is no, don't hold your breath (you must not hold your breath when diving), take a small breath of air, continue to spit until the light, and after diving two meters, you can dive quickly.

2. Long inhalation and slow exhalation

Long inhalation and slow exhalation can allow your body to do the greatest exchange of air, but it is really exhausting, you can also use 1 short and 1 long breathing, that is, long inhalation and slow exhalation, short inhalation (inhaling a little air, not a large inhalation quickly) and exhaling slowly. In this way, the air can be kept for a more complete exchange, and the air can also be saved.

3. Buoyancy control in shallow waters

In shallow water, which is usually the end of our dive, the air in the tank is depleted, so the weight of the tank is reduced by 1-2kg.

So a lot of people are floating around at this time. At this time, it is recommended to make a quick and large ventilation of the air in the lungs. In the time of the buoyancy delay, the gas exchange is completed, so that the change in buoyancy is relatively difficult to occur.

But control your depth first, don't go up to the surface before you do it, the fins heel hand is the best tool.

If you find yourself floating, kick down with your fins to find a fixed object to grab or a buoyant buddy who still returns to the wild.