Scuba diving techniques with gas mixtures (Nitrox, Heliox, Trimix) or using rebreathers (also called assistive devices rebreathing or rebreathers) are considered within the category of technical or professional diving. This is because of risk and the level of preparation required by the divers who uses them (snorkeling grace bay beach).
According to different schools and regulations, recreational diving is usually limited to 20-40 meters deep, while professional diving with special mixtures allows access above 100 m depths. Snorkeling or apnea involves breathing a deep breath at the surface. It can be practiced without any special equipment, but the current configuration consists of recreational proper mask, fins, snorkel, weights, and if necessary, a suit of insulating material.
The regulator reduces high pressure of the water surrounding the diver, so that he can breathe normally and independently of cables and air supply tubes from the surface. In 1943 Jacques-Yves Cousteau and Emile Gagnan were the inventors of regulators, which are still currently used in (professional and recreational) scuba diving.
However, current safety standards require a number of tools that let you know how deep you are and what air pressure is left, called depth gauge and pressure gauge, respectively. Dive computers are also becoming popular, depending on depth, mixture of air and the time spent underwater, they indicate at all times the depth range where you can stay.
Notwithstanding the limited mobility diving diver because he stays connected to surface by an air hose. Scuba diving is one that does not require any connection to surface. The quest for autonomy by inventors occurred during the nineteenth century some inventions of limited effectiveness, the most notable of them being the regulator mentioned in Jules Verne’s novel Twenty Thousand leagues Under the Sea.
The role of wetsuits is to protect the diver from hypothermia. The thermal insulation of skin is not adapted to aquatic environments because the specific heat of water is higher than the air. In water below 27 degrees Celsius, it is recommended to be thermally insulated; temperatures below 22 degrees Celsius and with 15 degrees Celsius or less good insulation is essential.
There are different certifying agencies and government or private entities that are responsible for ensuring these processes. The main ones are: World Underwater Federation (CMAS) that is responsible for issuing their degrees. SSI Scuba Schools International (SSI). These agencies are guarantors of knowledge of minimum training standards for each level of competence of their members. The level of competence certified to a diver is reflected in type of degree.
The International Code of Signals provides that the alpha (A) flag on a stationary boat means submerged diver, keep your distance. The red flag with white diagonal is used internationally as identification of recreational diving, but is not valid as a warning to shipping because it is not part of International Code of Signals IMO (International Maritime Organization).
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