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Illustration of physiological changes and health risks (boxed red) during the descent and ascent of a deep breath-hold dive. Some examplary depths are marked (∗) to indicate critical physiological challenges or records achieved. Of note, health risks are not related to certain depths but rather depth ranges during descent or ascent, respectively. paO2 = arterial oxygen pressure; IPAVA = intrapulmonary arteriovenous anastomoses.
