Technical diving

Advanced Nitrox

High-oxygen decompression gases and oxygen-clean equipment — a different capability from recreational Nitrox.

Advanced Nitrox is not ordinary recreational Nitrox. It involves high-oxygen decompression gases, up to and including 100 percent oxygen, and the oxygen-clean equipment those gases require.

A centre offering ordinary EAN32 does not automatically provide Advanced Nitrox support. Recreational enriched air needs a compressor, a blending system and an analyser; high-oxygen support needs oxygen-clean cylinders, oxygen-compatible regulators and staff trained to handle them.

For a diver planning technical training, this is one of the first capability questions to resolve, because everything downstream depends on it.

Why oxygen cleaning matters

Oxygen at high partial pressure and high concentration reacts violently with hydrocarbons. A cylinder or regulator with ordinary compressor oil residue can ignite when filled with high-oxygen gas.

Oxygen cleaning removes those contaminants and is followed by using oxygen-compatible lubricants and components. It is not a formality and it is not something a centre does casually.

What to verify at a centre

These distinguish a facility that can support decompression gases from one that only fills recreational Nitrox.

oxygen fills and to what percentage
oxygen cleaning service for cylinders and valves
oxygen-compatible regulator servicing
stage cylinder hire, oxygen clean
analyser availability for divers
labelling and gas verification practice

Open-water training, represented by an AI-generated editorial image.

Related training

Advanced NitroxHigh-oxygen decompression gases and oxygen-clean equipment — not ordinary recreational Nitrox.Enriched Air NitroxDiving with elevated oxygen to extend no-decompression limits — the most commonly taken specialty.Decompression ProceduresPlanning and executing dives with a mandatory decompression obligation.

Where this applies in Australia

Port Phillip Heads WallsWalls starting at 12 metres and continuing beyond 90 — the terrain behind Victoria's technical culture.Ships' GraveyardNumerous vessels deliberately scuttled outside Port Phillip Bay across a wide depth range.SS NordA steamer lost in 1915, lying around 42 metres off the Tasman Peninsula.

Centres where this capability is documented

Documented does not mean verified in every detail — confirm the specific service directly.

The Scuba DoctorA Victorian equipment and service business with an extensive retail presence, located to serve both Melbourne and Mornington Peninsula divers.Diveline Scuba CentreA Victorian business associated with technical training and gas support alongside recreational courses.Perth ScubaOne of the most fully documented operations in Western Australia, covering recreational, professional, technical and freediving training alongside substantial equipment facilities.Indepth ScubaA Canberra operation that functions as both a training school and a life-support service facility, with cylinder testing and a full range of gas fills.

Frequently asked questions

Can I use my recreational cylinder for decompression gas?

Not unless it has been oxygen cleaned and fitted with oxygen-compatible components. This is a safety requirement, not a preference.

Why does a centre refuse to fill my cylinder with oxygen?

Because filling an uncleaned cylinder with high-oxygen gas is a genuine fire risk. The refusal is the centre behaving correctly.