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Competitive Free Diving

Apnea diving is also practiced as a competitive sport. For these competitions and record attempts, there are generally accepted rules of the Association of freediver Aida. This extensive regulatory framework imposes mandatory security standards and the conditions for the recognition of achievements and records.

The most important rule is that the athlete must realize his [...]

Dive computer scuba diving

A dive computer will help the divers in planning and conducting dives to avoid decompression sickness (bends). During the dive, the dive computer continuously measures the depth and dive time and computes a profile of the dive. The dive computer should be seen as a successor or to complement Dive tables.

Construction

The dive computer consists of [...]

Dissolution and diffusion scuba diving

On the surface, at sea level (1 bar), partial pressures of N2 and O2 are respectively of 0.8 bar and 0.2 bar. Normally the body’s tissues are saturated with N2 (N2 tension in tissue is 0.8 bar). But it is not like oxygen. In breathing, O2 is carried internally by hemoglobin in the blood, although [...]

Decompression Stops

In diving, a decompression is the time that it takes to move to a given depth to remove the nitrogen remaining in the tissues (including blood). It is part of decompression procedures for the prevention of decompression illnesses (ADD). A person’s depth and time are donated by the decompression tables or dive computer. The depth [...]

Decompression sickness

Decompression syndrome is the term used to describe the medical condition known as an acute embolism caused by a sudden decrease in atmospheric pressure. This disease is characterized by the appearance of small bubbles and inflammation at the subcutaneous, but the unequivocal symptom is the appearance of a very strong pain, which affects various body [...]

Decompression chamber

The decompression chamber is an airtight chamber for the controlled increase and decrease in air pressure ((re-) compression and decompression). It is used by commercial divers after being used for proper adjustment to the atmospheric pressure in order to prevent decompression sickness (caisson disease).

The stay in the decompression chamber can be as long and deep [...]

Scuba Diving Biochemical effects

Normally O2, as the gas consumed for cellular metabolism, has lower blood pressures than the alveolar partial pressures, whereas CO2, as a waste product, has blood pressures greater than the alveolar partial pressures. This creates a pressure gradient in the alveolar-blood interface, which allows gas exchange.

The body has a physiological mechanism that [...]

Aqualung Jacques Cousteau

This first valve was connected to the surface by a pump and was therefore not autonomous, but its operating principle was the same as those of Rouquayrol and Denayrouze and later Cousteau and Gagnan. The regulator Guillaumet knew immediately because of the absence of an intermediate tank which would have ensured a safety reserve [...]

Aqualung Components

Mask, snorkel, weight belt with weights, ankle boots and adjustable fins. The diver is normally equipped with thermal insulation clothing; a mask around the eyes and nose and makes possible the vision net while diving to compensate for variations in pressure (by balancing the pressure of the air captured in the mask); [...]

Accessory equipment

A Knife, by law is required in many countries. A knife would be used for cutting ends of abandoned drift nets that could endanger the life of the diver.

Flashlight or focus, which in the day helps the diver see dips in the rock caves or areas with low light. For night dives it [...]

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