Haldane's decompression model is a mathematical model for decompression to sea level atmospheric pressure of divers breathing compressed air at ambient pressure that was proposed in 1908 by the Scottish physiologist, John Scott Haldane, who was also famous for intrepid self-experimentation.
Decompression table-I in ft and psi. "Stoppages during the ascent of a diver after ordinary limits of time from surface."
Decompression table-II in ft and psi. "Stoppages during the ascent of a diver after delay beyond the ordinary limits of time from surface."
Paul Bert.
Decompression practice
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To prevent or minimize decompression sickness, divers must properly plan and monitor decompression. Divers follow a decompression model to safely allow the release of excess inert gases dissolved in their body tissues, which accommodated as a result of breathing at ambient pressures greater than surface atmospheric pressure. Decompression models take into account variables such as depth and time of dive, breathing gasses, altitude, and equipment to develop appropriate procedures for safe ascent.
Divers using the anchor cable as an aid to depth control during a decompression stop during ascent.
Technical diver at a decompression stop.
Divers breathing oxygen during surface decompression in the chamber after a 240 feet (73 m) dive
Part of a saturation system