A hyperbaric systems technician assembles, maintains and tests decompression chambers, saturation systems and clinical chambers. They work in workshops, hospitals, vessels and diving company bases, with tasks covering mechanics, pneumatics, environmental control, oxygen-service cleaning and pressure-vessel documentation.
There's a part of professional diving that never gets wet. Every decompression chamber on a vessel's deck, every saturation complex, every clinical hyperbaric oxygen therapy chamber installed in a hospital, has been assembled by someone, is inspected periodically and, before a person goes inside, is tested. That someone is the hyperbaric systems technician. It's an onshore career path, not very visible from outside, and one of the few ways to stay in the industry once you decide to leave the water.
What a hyperbaric system is and where it turns up
A hyperbaric system is a vessel capable of holding people at a pressure above atmospheric, along with everything needed so those people can breathe, not freeze or overheat, not poison themselves with their own CO2, and be able to return to the surface in a controlled way. The chamber is just the hull. What turns it into a system is the gas lines, the control panels, the analysers, the environmental control, the communications, the fire suppression and the procedures that govern its use.
The installed fleet is bigger and more varied than it looks. There's the diving world: surface decompression chambers that accompany almost any serious operation, twin-lock chambers at training centres, diving bells, and saturation complexes, which are systems of several interconnected chambers with medical locks, supply locks and complete life-support systems. These complexes live almost always aboard vessels, but there are also onshore saturation facilities for testing, training and research.
Then there's the clinical world. Hyperbaric oxygen therapy chambers in hospitals and private clinics treat carbon monoxide poisoning, decompression sickness, soft-tissue infections and slow-healing wounds. These are units running almost daily, with patients who aren't divers, with medical staff who aren't maintenance staff, and with a very high uptime requirement. A third, smaller group is made up of research and test chambers: physiology labs, material test rigs and pressure-rated equipment qualification chambers.
All of this equipment shares the same physics and the same failure modes. A fitting that's not tight enough, a valve that doesn't seat properly, or an analyser that's drifted are the same problem on a saturation vessel, in a workshop and on the ground floor of a hospital. That's why the trade is transferable, and why someone who's good at it can move between sectors that, seen from outside, look like they have nothing in common.
What the job involves
The first strand is assembly and commissioning. A chamber arrives on site as a hull, with its penetrations and doors, and it has to be turned into a working installation: anchored, the control panel fitted, gas lines run from the cylinder banks or fixed storage, environmental control installed, alarms and communications wired, and everything labelled. Commissioning isn't switching it on and seeing if it works: it's a point-by-point verification process, with a signed checklist, that proves every valve does what its label says and every alarm trips when it should.
The second strand, which takes up most of the time, is preventive maintenance. Here the work is routine in the good sense of the word: there's a plan, there are intervals and there are records. Valves and fittings are checked, seats and gaskets replaced, gauges checked against a reference standard, safety valves verified, hoses inspected, bulkhead penetrations and door and viewport seals checked, and oxygen and carbon dioxide analysers calibrated. Analysers get a chapter of their own: a wrong oxygen reading is a wrong operational decision, so they're calibrated against reference gases and every calibration is logged.
The third strand is gas, and it's where the trade parts ways with ordinary industrial maintenance. Anything that's going to be in contact with pressurised oxygen has to be clean for oxygen service: no grease, no oils, no swarf, no solvent residue, with compatible materials and lubricants, and with a cleaning and bagging procedure that's kept up right through to final assembly. It isn't lab pedantry. A pipe with traces of oil and pressurised oxygen is an ignition mechanism, and the consequences in an enclosed space with people inside are what they are. Anyone who hasn't taken this on board shouldn't be touching an oxygen line.
The fourth strand is control of the interior environment. Inside an occupied chamber, temperature and humidity have to be kept within tight margins, especially in helium mixes, where the gas's thermal conductivity turns a few degrees into a serious problem. CO2 exhaled by the occupants has to be removed, usually by circulating the gas through soda lime beds, with monitoring of absorbent saturation and logged replacement. And oxygen has to be kept within the correct window, with make-up and purging, because both a shortfall and an excess have consequences.
The fifth strand is fire safety. An oxygen-enriched atmosphere completely changes how fire behaves, so the pressurised water fire suppression systems, the internal hoses, the nozzles and the controls, both outside and inside, are tested on a strict schedule and always left in working order. The same goes for the emergency breathing masks, known as BIBS, and their supply and overboard dump lines.
The sixth strand is testing. Before a system is handed over, and after any intervention that affects containment, leak tests and pressure tests are carried out. It's pressurised in stages, with stabilisation periods, pressures and temperatures are logged, any drop that shouldn't be there is hunted down and the point causing it is located. It's slow, patient work, and anyone who rushes ends up doing it twice. This is where the difference between a trained technician and someone who just knows how to tighten bolts shows.
Documentation isn't an afterthought
In regulatory terms, a hyperbaric chamber is a pressure vessel, and as such it's subject to a framework of manufacture, marking, periodic inspection and traceability. The specific detail varies by country and by the body involved, but the general mechanism is the same everywhere: there's a record for the equipment that follows it through its whole working life, and that record has to be complete and consistent with what's actually installed.
The technician lives with that record every day. In practice this comes down to very specific things:
- Manufacturing certificates for the vessel and its pressure fittings.
- Drawings of the gas lines and control panel schematics, updated after every modification.
- Historical log of periodic inspections and pressure tests carried out.
- Preventive and corrective maintenance records, with parts replaced and batch numbers.
- Calibration certificates for gauges, analysers and measuring equipment.
- Analysis certificates for the gases supplied and cylinder traceability.
- Oxygen-service cleaning records for the components worked on.
Anyone coming from diving picks this up fast, because the industry already runs on records. Anyone coming from an industrial workshop sometimes experiences it as bureaucracy, and that's a misreading. Documentation is what lets you prove the equipment was in proper condition, and it's the first thing looked at when something goes wrong. Flawless maintenance with no record, in practical terms, never happened.
Why this career path exists
Demand comes from two places. On one hand, anyone operating chambers needs someone to maintain them, and diving companies and saturation system operators don't always have that profile in-house: they subcontract it to workshops and specialist service companies. On the other, hyperbaric oxygen therapy has been growing as a clinical service, and hospitals don't have their own hyperbaric technicians; their general maintenance staff aren't set up for high-pressure oxygen lines or occupied vessels.
The supply, for the most part, comes from within the industry itself. There are divers who reach a point where they want to stop getting in the water (age, family, a medical review that gets complicated) and don't want to throw away fifteen years of knowledge. A saturation diver has lived inside the system, has seen the panel from the other side of the viewport and knows what every noise means. If you're interested in understanding that environment from the inside, the natural starting point is what a saturation diver is and how their work is structured.
The other route in is the reverse: technicians who come from industrial, naval or medical gas maintenance, who are strong on the mechanical and instrumentation side and learn the hyperbaric specifics on the job. They tend to be good with fluids, welding and instrumentation, and their learning curve is on the human factor: understanding that there are people inside and that this sets the pace of the work.
Training and profile
There's no universal hyperbaric technician qualification equivalent to a diver's. What exists is a combination of a technical base plus specialisation, usually gained through the equipment manufacturer, the service company or specific courses. The useful base is fluid mechanics and pneumatics, some electrical and control knowledge, the ability to read a piping diagram, welding or at least the judgement to assess it, and basic metrology.
On top of that base come the specific competencies: oxygen-service cleaning, handling compressed gases and mixes, analyser calibration, knowledge of CO2 absorption systems and familiarity with the pressure vessel documentation framework. Many centres that train divers keep their own fleet of chambers and are a reasonable place to get hands-on contact with this equipment; the map of professional diving schools is useful for finding them, although the specific maintenance training usually comes later, through a different route.
Personal traits matter as much as technical ones. This is a procedure-driven trade: you follow the checklist, you sign off what's been done, you don't improvise and you don't take anything as good without checking it. Someone who enjoys solving problems on the fly with whatever's to hand, an asset in other contexts, is a liability here. Knowing the equipment from the user's side helps a lot, and that's why it's worth understanding how professional diving equipment works before taking on maintaining it.
How to get in
The most common route in is sideways. You start as a helper in a workshop or service company, accompanying an experienced technician through assemblies and inspections, and take on your own work as you prove your judgement. For divers, the transition often happens within the same company: someone who already knew the people moves from the deck to the workshop without changing employer. Seeing what kind of companies operate these systems helps focus the search, and that's what the directory of industry companies.
The link to a diving career is real but not automatic. Being a diver doesn't make you a hyperbaric technician, just as being a driver doesn't make you a mechanic. What diving brings is context: understanding decompression physiology, knowing how to read a table, knowing emergency procedures and having lived what it means to depend on a machine. That context shortens the learning curve a lot and explains why companies value the mixed profile. Anyone starting out and weighing up both routes can first look at how to become a commercial diver and decide afterwards.
The realities of the job
It's a land-based job, but it isn't an office job. You travel: the equipment is where it is, and inspections happen on the client's site, sometimes aboard a vessel in port, under the pressure of a time window that can't be stretched. There are on-call rotations and out-of-hours calls, especially with clinical chambers, where a fault can leave an emergency service without cover. And there's a weight of responsibility that doesn't come across well from outside: the signature on a pressure test record is what allows someone to go into that vessel.
In return, it's a stable career, with knowledge that builds up over time and reasonably steady demand, because the installed fleet doesn't disappear and periodic inspections can't be put off indefinitely. It isn't a high-volume path or a market with abundant openings; it moves a lot through contacts and reputation within a small industry, and few formal vacancies ever get published. It's worth keeping a continuous eye on both industry job channels and the operating companies' own circles, because in this trade you usually get in through the side door rather than the front one.
Frequently asked questions
Do you need to be a diver to work as a hyperbaric chamber technician?
It isn't a requirement. Many technicians come from industrial, naval or medical gas maintenance and learn the hyperbaric side on the job. Having dived professionally brings very valuable context (physiology, procedures, understanding the equipment from the inside) and shortens the learning curve, which is why companies value the mixed profile, but it doesn't replace technical competence in fluids, pneumatics and instrumentation.
What technical training is most useful for starting out?
A base in mechanics and pneumatics, a grounding in electricity and control, the ability to read piping and instrumentation diagrams, and basic metrology. On top of that comes the specific knowledge: oxygen-service cleaning, handling compressed gases and mixes, analyser calibration, CO2 absorption systems and familiarity with the pressure vessel documentation framework. That part is usually gained with the manufacturer or at the service company itself.
Why is so much emphasis placed on oxygen-service cleaning?
Because pressurised oxygen in contact with grease, oils or residue can cause ignition. In an enclosed, occupied space, with an enriched atmosphere that also speeds up combustion, the consequences are severe. That's why every component that will be in contact with oxygen is cleaned following a procedure, protected until assembly and documented, and why compatible materials and lubricants are used.
Where are these systems installed besides in diving?
In hospitals and clinics with hyperbaric oxygen therapy, which are a fleet running almost daily; at professional diving training centres, which keep their own chambers; on diving vessels and saturation complexes; and in research labs and material test rigs. They share the same physics and the same failure modes, so a trained technician can move between apparently very different sectors.
Is it a fixed-hours job because it's on land?
Not entirely. You travel to the client's site and interventions fit around time windows set by someone else, such as a vessel's port call. There are on-call rotations and out-of-hours callouts, especially with clinical chambers, where a fault can leave a service uncovered. It's more predictable than going to sea, but it's still a trade involving travel and availability.
Published 10 September 2026 · By Arthur More, professional saturation diver
Photo: SFU - Communications & Marketing · CC BY via Openverse