Technical diving

Technical Gas in Australia

Air, Nitrox, oxygen, helium and Trimix — what to verify and where it is actually available.

Gas logistics determine whether a technical trip is possible, and they are the thing most often assumed rather than verified.

Every listing should record air, Nitrox, oxygen, helium, Trimix, custom blending, booster availability, CCR oxygen, sorb and stage hire as separate items, each with a verification date.

Helium availability in particular should always be treated as time sensitive. Supply fluctuates globally, and a centre's capability can change between one season and the next.

Fields worth recording per facility

A simple yes or no on "technical gas" tells a diver almost nothing. These do.

air fills and pressure available
Nitrox — standard mixes and custom
oxygen and to what percentage
helium and current supply reliability
Trimix — custom blending or fixed mixes only
booster availability for high-pressure fills
CCR oxygen fills
sorb brand and stock
stage and technical cylinder hire
cylinder oxygen cleaning
date each item was last verified

Analyse your own gas

Whatever a fill sheet says, divers should analyse their own cylinder before use and record the result.

This is standard practice at every level from recreational Nitrox upward, and it is the last line of defence against a labelling error.

Remote destinations

Never assume technical gas is available at a remote destination simply because technical diving is possible there.

Perth is Western Australia's main technical support hub; Ningaloo, the Abrolhos, Christmas Island and Cocos are not. Plan gas logistics for remote trips weeks ahead.

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

Related training

Enriched Air NitroxDiving with elevated oxygen to extend no-decompression limits — the most commonly taken specialty.Advanced NitroxHigh-oxygen decompression gases and oxygen-clean equipment — not ordinary recreational Nitrox.Trimix DiverAdding helium to manage narcosis, oxygen exposure and gas density at depth.Closed Circuit Rebreather DiverRecycling breathing gas to extend duration, reduce bubbles and optimise oxygen exposure.

Where this applies in Australia

Ships' GraveyardNumerous vessels deliberately scuttled outside Port Phillip Bay across a wide depth range.Port Phillip Heads WallsWalls starting at 12 metres and continuing beyond 90 — the terrain behind Victoria's technical culture.Kilsby's SinkholeA limestone sinkhole with water so clear the experience is closer to flying than diving.

Centres where this capability is documented

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

Dive Centre ManlyA Northern Beaches operation with a long-standing presence at Shelly Beach, offering recreational training, boat diving and technical pathways.The Scuba DoctorA Victorian equipment and service business with an extensive retail presence, located to serve both Melbourne and Mornington Peninsula divers.Perth ScubaOne of the most fully documented operations in Western Australia, covering recreational, professional, technical and freediving training alongside substantial equipment facilities.Dolphin Scuba DivingA Perth business providing training, equipment and service support.Tasmania Tech and Dive CentreThe Tasmanian operation most clearly associated with technical diving services, spanning recreational and technical training with technical gas support.

Frequently asked questions

Why does helium availability change so often?

Helium is a finite resource with competing industrial and medical demand, and global supply has been constrained repeatedly. Local availability follows those fluctuations.

Can I travel with my own cylinders?

Cylinders must be empty and valves removed for air travel, which means arranging fills at the destination. For technical gases, that arrangement needs to be made in advance.