Dominion Heliox Diving Gases Helium (He) and Oxygen (O2).

Heliox a breathing gas composed of a mixture of helium (He) and oxygen (O2). Helium breathing gas mixture enables divers to work at greater depths for vital repairs and construction work associated with the offshore oil industry. Helium does not react with any of the body's chemical functions and it is also virtually impossible for it to dissolve in the blood, even at pressure. Heliox is generally used at depths over 50 metres because the helium gas allows greater depths of dive and avoids the effects of Nitrogen Narcosis.