When freediving to depth a thoracic squeeze, or lung squeeze, can occur when the lungs become compressed to a volume less than what the individual’s normal Residual Volume (approximately 25% of total lung volume) would be. This is due to progressively increasing water pressure during the descent. The symptom of lung squeeze is a sense of extreme pressure and discomfort. Leaking blood vessels in the lungs can occur as a result from a lung squeeze.
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