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Hypoxia – A state of the body where oxygen levels are reduced to the point of causing signs and symptoms in the body. In freediving, hypoxia is one of the causes of divers losing consciousness. Hypoxia affects all systems of the body, but shows the most profound reaction in the brain. By nature, freedivers risk hypoxia because they are holding their breath while they freedive. Experienced freedivers are able to tolerate remarkable levels of hypoxia. Safety is paramount whenever the risk of hypoxia is elevated.

Mammalian Diving Reflex – A reflex of all mammals that causes changes in the body’s physiology when breath hold diving.

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Pictures provided by Rebecca Garrett, Deron Verbeck, Tec Clark and Jon Zeaman.