A theoretical no-decompression curve for dives in which an 80% helium – 20% oxygen breathing mixture is employed was postulated from known data. 109 test dives were then performed using depth-time combinations falling along this curve, using 17 enlisted navy divers as subjects. The limiting rate of ascent following dives in which an 80%He-20%02 breathing mixture was employed was also investigated. 78 dives employing decompression stops were also performed.
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