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en.wikipedia.org/wiki/Underwater_diving

Underwater diving, as a human activity, is the practice of descending below the water's surface to interact with the environment. Immersion in water and exposure to high ambient pressure has physiological effects that limit the depths and duration possible in ambient pressure diving. ..... other valuable resources such as pearls and coral, from before 4500 BCE.

en.wikipedia.org/wiki/Pearl_hunting

Pearl hunting is the act of recovering pearls from oysters in the sea. Pearl hunting used to be prevalent in the Persian Gulf region and Japan. Pearl diver in ...

www.runnersworld.com/sweat-science/the-amazing-physiology-of-pearl-divers

Mar 28, 2016 ... There are about 2,000 “Ama” left in Japan—female pearl divers who ... increasing your blood pressure, and causing your heart rate to drop.

divingphysiology.wordpress.com/the-bends

He suggested that increasing pressure at depth would compress the lungs and .... For example, reports of accidents in pearl divers from the Tuamotu Islands ...

traveltips.usatoday.com/dangers-scuba-diving-2492.html

Most of these scuba diving dangers stem from the effects of the increased water pressure of the undersea environment, but there are also dangers posed by sea  ...

www.bbc.com/news/science-environment-12151830

Jan 12, 2011 ... But the bodies of habitual freedivers, who hold their breath for minutes at a ... Underwater pressure constricts the spleen, squeezing out extra ...

www.thoughtco.com/definition-of-a-squeeze-scuba-diving-2963246

May 9, 2017 ... A squeeze occurs in scuba diving when the pressure of the water ... he will not feel the effects of water in most of his body; a diver's arms and ...

www.buzzfeed.com/jamesnestor/the-master-switch-of-life

Aug 22, 2014 ... The equivalent pressures of such a deep dive on land would kill or injure us, ... 100 feet, the Master Switch slowly reverses its effects: The heart rate ... Switch and employed them for centuries to harvest sponges, pearls, coral, ...

www.theatlantic.com/magazine/archive/1997/05/underwater-daredevils/376862

Mother of pearl, for example, harvested from the deep, adorns carved ornaments ... With increasing depth, pressure compresses the chest, giving divers the false ...