deep diving

Freediving – Underwater diving without breathing apparatus

Breathing gas – Gas used for human respiration

Heliox – A breathing gas mixed from helium and oxygen

Trimix – Breathing gas consisting of oxygen, helium and nitrogen

Hydreliox – Breathing gas mixture of helium, oxygen and hydrogen

Compression arthralgia – Joint pain caused by fast compression to high ambient pressure

High-pressure nervous syndrome – Reversible disorder caused by breathing helium based gas below about 150 m

Oxygen toxicity – Toxic effects of breathing oxygen at high concentrations

Isobaric counterdiffusion – Gaseous diffusion through body tissue at constant pressure

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