Repetitive Excursion Dives from Saturated Depths on Helium-Oxygen Mixtures. Phase II. Saturation Depth 200 Feet, Saturation Depth 150 Feet

摘要

Two 200-foot and three 150-foot saturation dives were conducted at the US Navy Experimental Diving Unit to verify a no-decompression repetitive-excursion format developed by the Deep Submergence Systems Project (PM-11). Twenty divers completed a total of 360 man-excursion dives from the saturation depths to depths not exceeding 100 feet deeper than their base depth. No symptoms of decompression sickness were reported during the excursion dives, during the bottom time at 200 and 150 feet or during the first 24 hours of decompression back to the surface. This criteria is considered to be satisfactory evidence of the safety of the repetitive-excursion format. Four cases of decompression sickness occurred during decompression to the surface. One case of decompression sickness occurred 8 hours and 21 minutes after surfacing. All five cases are briefly discussed. (Author)