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Beginning in shallow water, trainees worked their way up to more challenging depths. After about seven years of training, a girl was considered a "full-fledged" haenyeo . [ 4 ] Today, the oldest haenyeo are over 80 years old, and have been diving for more than 66 years.
A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]
Alessia Zecchini. Alessia Zecchini (born 30 June 1992) is an Italian freediver who has set world and Italian records in freediving. [ 1][ 2] At the age of 13, Zecchini completed her first federal apnea course in A.s.d. "Apnea Blu Mare". In 2009 she changed clubs and became an athlete of Dive Free Roma and Nuoto Belle Arti.
Human physiology of underwater diving. Human physiology of underwater diving is the physiological influences of the underwater environment on the human diver, and adaptations to operating underwater, both during breath-hold dives and while breathing at ambient pressure from a suitable breathing gas supply. It, therefore, includes the range of ...
Diving mask. A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including scuba divers, free-divers, and snorkelers, to see clearly underwater. [ 1][ 2] Surface supplied divers usually use a full face mask or diving helmet, but in some systems the half mask may be used. [ 2]
Underwater vision. Scuba diver with bifocal lenses fitted to a mask. Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through the water.
The diver wears a full-face mask or helmet, and gas may be supplied on demand or as a continuous free flow. More basic equipment that uses only an air hose is called an airline or hookah system. [50] [48] [51] This allows the diver to breathe using an air supply hose from a high pressure cylinder or diving air compressor at the surface ...
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