HSE Closed Bell Saturation Commercial Diver Qualification Practice Questions - HSE Closed Bell Saturation Commercial Diver Qualification (UK HSE IMCA) Exam

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What is the primary physiological reason helium is substituted for nitrogen in breathing gas mixtures for deep commercial saturation diving?

To decrease the overall decompression time compared to surface air diving To prevent hypothermia by increasing body heat retention inside the bell To eliminate the risk of central nervous system oxygen toxicity during deep dives To prevent nitrogen narcosis and reduce respiratory gas density at extreme depths

Correct Answer:

To prevent nitrogen narcosis and reduce respiratory gas density at extreme depths

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