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Experiment of nitrox saturation diving with trimix excursion.

Z Y Shi1

  • 1Chinese Underwater Technology Institute, Shanghai, P.R. China.

Applied Human Science : Journal of Physiological Anthropology
|March 3, 1999
PubMed
Summary
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This study demonstrates that helium-rich trimix excursions to 80 meters (msw) are feasible from nitrox saturation. Divers experienced minimal decompression issues and no symptoms, indicating effective procedures for deep diving operations.

Area of Science:

  • Hyperbaric and Diving Medicine
  • Physiological and Performance Studies

Background:

  • Standard air diving is limited by gas density, oxygen toxicity, nitrogen narcosis, and decompression requirements.
  • Helium-nitrogen-oxygen (trimix) offers potential advantages for deep diving by mitigating narcosis and reducing gas density.

Purpose of the Study:

  • To evaluate decompression, counterdiffusion, and performance during helium-nitrogen-oxygen excursions from nitrox saturation.
  • To assess the safety and efficacy of trimix for simulated deep diving excursions.

Main Methods:

  • Four divers were saturated in a nitrogen-oxygen environment at 25 msw for 8 days.
  • 32 excursions were conducted to 60 or 80 msw using a trimix gas (14.6% O2, 50% He, 35.4% N2).
  • Decompression was calculated using M-Values; performance was assessed via moderate work on a bicycle ergometer.

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Main Results:

  • Staged decompression times were 70 min for 60 msw and 98 min for 80 msw excursions.
  • Post-excursion bubbles (Spencer Grade III) were observed in some divers, but no symptoms were reported.
  • Saturation decompression using Repex procedures was uneventful, with bubbles persisting for up to 24 hours in some divers.

Conclusions:

  • Excursions to 80 msw using helium-rich trimix are effectively achievable from nitrox saturation.
  • The employed decompression and excursion procedures appear safe and effective for simulated deep diving.