ADAPTATION OF HELIUM-OXYGEN TO MIXED-GAS SCUBA.
NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
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A decompression procedure for use of helium-oxygen mixtures in mixed gas SCUBA to permit repetitive dives to a depth of 200 feet has been developed employing modified Haldane principles. The repetitive diving procedure provides a system by which a diver can determine the necessary increase in decompression time on successive dives, based on the amount of excess inert gas tension in body tissues after completion of previous dives. The amount of decompression required is decreased by the time interval at the surface between dives. The information required for use of this system is obtained from four tables 1 Decompression table 2 No decompression dive table 3 Surface interval credit table and 4 Repetitive dive time table. A method for use of oxygen decompression at 30 and 20 foot water stops is also provided. The validity of this procedure is based on tests of 486 dives in which 28 three-dive series and 68 oxygen decompression dives were made. The procedure as reported is considered satisfactory and is recommended for further testing under operational conditions in the field before service-wide use. Author