saturation diving

noun
a method of prolonged diving, using an underwater habitat to allow divers to remain in the high-pressure environment of the ocean depths long enough for their body tissues to become saturated with the inert components of the pressurized gas mixture that they breathe: when this condition is reached, the amount of time required for decompression remains the same, whether the dive lasts a day, a week, or a month.

Origin:
1965–70

saturation dive, noun
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World English Dictionary
saturation diving
 
n
a method of diving in which divers live in a complex of decompression chambers for up to 28 days, going to work via a diving bell, and only decompressing at the end of the period. Helium is substituted for nitrogen in the air supply to avoid the narcotic effects of nitrogen

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Example sentences
The saturation diving rate applies when divers are under pressure continuously until work task and decompression are complete.
The saturation diving rate applies when divers are under.
Twelve candidates for this exciting saturation diving project are undergoing review of their applications and qualifications.
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