Sealed chamber supplying a high-pressure atmosphere primarily for medical therapy. Breathing air or oxygen at typically 1.5–3 times normal pressure increases the oxygen level in tissues. This effect is used, for example, to treat carbon monoxide poisoning or to inhibit growth of anaerobic bacteria (as in gas gangrene). The compressive effect of the elevated pressure causes damaging gas bubbles in tissues (as in air embolism or decompression sickness) to shrink and gradually be absorbed.
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Often the terms "decompression chamber", "recompression chamber" and "hyperbaric oxygen therapy chamber" are used interchangeably. The names reflect the different purposes that the chambers are designed for, rather than their capability. Each is capable of operating in the others' role:
A decompression chamber is used in various films. Most notable was the movie Licence to Kill as Krest was decompressed and expanded to messy effect. Decompression chambers are also used in the game Unreal Tournament where players or bots would enter and enemies would push a button which decompressed them to a pulp.