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A diving fatality due to oxygen toxicity during a "technical" dive
1NSW Institute of Forensic Medicine, Sydney, NSW. IOFM@OZEMAIL.COM.AU
The Medical Journal of Australia
|September 2, 1996
Summary
A technical diver died from oxygen toxicity during a deep dive due to improper use of enriched air. This case highlights risks associated with enriched air and equipment failures in diving.
Area of Science:
- Diving Medicine
- Hyperbaric Physiology
Background:
- Technical diving involves complex gas mixtures and equipment for extended underwater operations.
- Oxygen toxicity is a risk in diving when partial pressures of oxygen exceed safe limits.
Observation:
- An experienced diver experienced a generalized seizure and drowned during a 47m technical dive.
- The diver utilized a 50% oxygen/nitrogen gas mixture, which was inappropriate for the dive depth and duration.
- The dive lasted 19 minutes, increasing the risk of physiological complications.
Findings:
- The seizure was directly attributed to acute oxygen toxicity, a consequence of hyperoxia at depth.
- Inappropriate use of enriched air (50% oxygen) significantly elevated the risk of central nervous system (CNS) oxygen toxicity.
- Potential equipment shortcomings may have contributed to the incident, necessitating a thorough examination.
Implications:
- This case underscores the critical danger of oxygen toxicity from enriched air in deep technical dives.
- It emphasizes the necessity for divers to possess comprehensive knowledge of diving physiology and gas management.
- Thorough pre-dive equipment inspection and physiological assessment are crucial for preventing diving accidents.
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