The Heliox reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Heliox

Helioxis a diving breathing gas, consisting of oxygen and helium, that is often used during the deep phase of dives carried out using Technical diving techniques.

It is a more expensive gas than its close rival Trimix and is more often used in commercial diving.

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