Repetitive Excursion Dives from Saturated Depths on Helium-Oxygen Mixtures. Phase IV. Saturation Depth 500 Feet, Saturation Depth 600 Feet

摘要

One 500-foot and two 600-foot saturation dives were conducted at the Navy Experimental Diving Unit to verify a no-decompression repetitive-excursion format developed by the Deep Submergence Systems Project (PM-11). This is the same table previously tested and found to be satisfactory for repetitive-excursion dives from saturation depths of 350 feet and 300 feet. Twelve divers completed a total of 206 man-excursion dives from the respective saturation depths to depths not exceeding 150 feet deeper than their base depth. No symptoms of decompression sickness were reported during the bottom time at 500 feet and 600 feet or during the first 200 feet of decompression back to the surface. This criteria is considered to be satisfactory evidence of the safety of the repetitive-excursion format. Three cases of decompression sickness did occur during the latter stages of decompression, and they are briefly discussed. (Author)