Immersion in water and exposure to cold water and high pressure have physiological effects on the diver which limit the depths and duration possible in ambient pressure … See more

People may dive for various reasons, both personal and professional. While a newly qualified recreational diver may dive purely for the experience of diving, most divers have some … See more

Freediving as a widespread means of hunting and gathering, both for food and other valuable resources such as pearls and See more

Due to the inherent risks of the environment and the necessity to operate the equipment correctly, both under normal conditions and during incidents where failure to … See more

There are several modes of diving distinguished largely by the breathing gas supply system used, and whether the diver is exposed to the ambient pressure. The diving equipment, support equipment and procedures are largely determined by the mode. See more

The diving environment is limited by accessibility and risk, but includes water and occasionally other liquids. Most underwater diving is … See more

Underwater diver training is normally given by a qualified instructor who is a member of one of many diver training agencies or is registered with a … See more