How Do Free Divers Not Float?

August 18, 2022 3 min read

In this article, we'll explore negative buoyancy, floats, fins, and Nitrogen narcosis. If you're a free diver who has ever tried to float, you'll be glad to know that there are a few simple things you can do to avoid floating. Below, we'll explain how to swim with your legs slightly bent and your body weight evenly distributed.

Negative Buoyancy

In free diving, a diver has neutral buoyancy. A ping-pong ball will float and a lead ball will sink. If you don't move, you have neutral buoyancy. You can float by exhaling, and sink by inhaling. Then, you can breathe to maintain neutral buoyancy. This is the ideal state for cruising over coral or wrecks. The only downside to this neutral buoyancy state is the increased time you need to hold your breath.

The main reason a free diver needs positive buoyancy while on the surface is for the safety of his life. Freedivers need to conserve energy in the last few meters of their ascent, where they are exposed to the greatest risk of drowning or developing decompression sickness. By maintaining positive buoyancy during the last few meters of their ascent, freedivers can avoid blackouts in shallow water and save energy by staying at a safer buoyancy level.


Freediving uses fins to propel the body through the water, but these are not the best option for beginners. They are stiff and can lead to leg bending and an imbalanced kick. This will result in a slow, backward freefall. If you do not know how to swim with fins, a good place to start is by finding a local diving school and taking a freediving class.

The first thing you need to know about freediving is that it is a dangerous sport. It is second only to base jumping in terms of danger. However, proper instruction and safety will improve your breath-holding abilities and help you make the most of your underwater excursions. But don't worry, there are many benefits to this extreme activity. Read on to find out why freedivers should be more cautious.


There is a scientific explanation for why free divers do not float. While a diver's body weight and volume remain unchanged, his density rises when his weight is compared to the surrounding water. This increases his buoyancy. The lungs have a very similar density to water and act like balloons. As a result, they tend to be buoyant in water. In contrast, the lungs of a free diver have a much lower density than the surrounding water.

To perform freediving, the diver must breathe up. Then he must exhale through his mouth. The exhalation must be longer than the inhalation to reduce the diver's heart rate. Freedivers must breathe up two minutes before the dive. A freediver should always be relaxed before diving. If he becomes panicked, he should focus on slowly returning to the surface and start the recovery breathing process.

Nitrogen Narcosis

When the amount of nitrogen in a river system reaches a certain level, it becomes unstable and is not able to support the free flow of water downstream. This phenomenon is similar to mild alcohol intoxication and affects higher cognitive functions such as short-term memory. Other symptoms include decreased manual dexterity, anxiety, and fatigue. In extreme cases, nitrogen narcosis can cause unconsciousness and may even result in an accident.

There are several causes of nitrogen narcosis. These include repeated breath-hold diving and exposure to high-nitrogen levels in the environment. Divers who are prone to this problem should know their limits and follow the "surface interval rule." Nitrogen narcosis is also facilitated by drugs and fatigue. It is vital to know the causes of nitrogen narcosis and how to prevent it.

Surface Dive

It is possible to dewater a submarine in its submerged state with the use of a salvage air system. In Dragonet's case, dewatering succeeded, and the submarine was not upended. The main reason is that the internal tank and dive planes are not used to compensate longitudinal moments during free surface dives. A submarine can absorb a large amount of flooding within its tanks and internal compartments. The forward torpedo room, however, might not be saved due to flooding.

When the diver is fully submerged, stability calculations are relatively simple. The center of buoyancy and transverse metacenter of mass move to the same position. The vertical distance between the center of gravity and the center of buoyancy is called metacentric height. The calculations for weight and buoyancy changes involve both weight and moment computations. Once the diver is submerged, the buoyancy and weight ratios are calculated. It is important to remember that the maximum stability of a free surface dive is temporary.

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