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An '''uncontrolled decompression''' is an undesired drop in the [[pressure]] of a sealed system, such as a [[Cabin pressurization|pressurised aircraft cabin]] or [[hyperbaric chamber]], that typically results from [[human error]], structural failure, or [[impact (mechanics)|impact]], causing the pressurised vessel to vent into its surroundings or fail to pressurize at all.
Such decompression may be classed as ''explosive, rapid
* '''Explosive decompression''' (ED) is violent and too fast for air to escape safely from the [[lung]]s and other air-filled cavities in the body such as the [[Paranasal sinuses|sinuses]] and [[eustachian tube]]s, typically resulting in severe to fatal [[barotrauma]].
* '''Rapid decompression''' may be slow enough to allow cavities to vent but may still cause serious barotrauma or discomfort.
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