Hydrogen produced at sea needs electrolysers, platforms, moorings and pipelines, and all of that has a submerged part that someone has to inspect and repair. For the diver the work looks a lot like offshore wind and oil and gas, but the sector is still at the pilot-project stage.
Green hydrogen takes up a lot of space in energy-sector presentations and a lot less in work reports. Even so, it's one of the questions that comes up most among young divers: if offshore energy is moving towards hydrogen, what's left for commercial diving?
The short answer is that what's left is what's always been left, because offshore hydrogen doesn't float in the air: it needs structures, moorings, cables and pipelines, and all of that either sits on the seabed or hangs off something. The long answer requires separating what already exists from what's still just a plan.
What offshore green hydrogen actually is
Hydrogen is called green when it's produced by electrolysis of water using electricity from renewable sources. When that electricity comes from offshore wind turbines, there are two ways of organising it.
The first is bringing the electricity ashore by cable and doing the electrolysis at a coastal plant. Underwater, almost nothing changes compared with a conventional wind farm: there are export cables, and cables array running between turbines and foundations or moorings.
The second is producing the hydrogen at sea, on a dedicated platform or even integrated into the turbine itself, and bringing it ashore by pipeline. This is the option that introduces new elements: a process platform, a riser, and a subsea pipeline that carries gas instead of electricity.
Why the second option matters for diving
Because a subsea pipeline and a process platform are, in terms of underwater work, a familiar scenario. What's done there is already done in plataformas gas fields: pipeline inspection, cathodic protection monitoring, checking flanges and supports, mooring system maintenance.
In other words, no new discipline appears. What appears is a new client for disciplines that already exist. Someone who knows how to do visual inspection, measure wall thickness or handle hydraulic tools is just as useful on a hydrogen pipeline as on a natural gas one.
What underwater infrastructure it actually generates
It's worth going into the detail, because that's where the potential volume of work becomes visible.
Moorings and foundations
If the electrolysis platform is floating, it has a mooring system with lines, chains and anchors. That system is inspected periodically, and it's work that teams from floating windalready know well: checking links, measuring wear, checking tensions and the geometry of the catenaria.
Cables and umbilicals
Even though the hydrogen travels by pipeline, there are still cables: auxiliary power, control, communications. The critical points are the usual ones — the J-tube entry and the sections where the cable ends up exposed by sediment movement.
Gas pipelines
Here there's a technical nuance that is specific to hydrogen: material compatibility. Hydrogen can embrittle certain steels under particular pressure and temperature conditions, which is why material selection and inspection criteria are worked out in more detail than on a conventional natural gas line.
For the diver, in practice, that translates into more demanding inspection programmes and more attention to welds and joints. The technique doesn't change; the frequency and the acceptance criteria do.
Where it's happening
The main geographic focus is in northern Europe, where there's already a mature offshore wind industry and a network of gas pipelines being considered for reuse. It's the same region where the North Sea already concentrates a good part of saturation diving activity.
This has a practical consequence: if offshore hydrogen does end up generating diving work, it will do so in markets that are already demanding on certification and documentation. Anyone wanting to be there needs the same credentials they need today to work in the North Sea, no more and no less.
What caution is worth having
It's easy to confuse the volume of announcements with the volume of contracts. Many offshore hydrogen projects are still at the study stage, and several have changed their timeline or scope since they were first presented.
For a diver planning their career, the sensible thing is to treat it as a possibility, not a bet. The same logic applies to any emerging niche: it's worth knowing what it is and understanding that the technical base is transferable, but not worth reorganising your training around a sector that still has no fleet and no regular campaigns.
What is transferable
Almost everything. Structural inspection, mooring work, knowledge of process systems, permit to work and risk assessment, the discipline of operating alongside a live installation. A diver already working in offshore wind or oil and gas doesn't need to reinvent themselves.
What would need to be learned
Fundamentally, process safety as applied to a light, flammable gas, and the operator's specific procedures. That's learned inside the company and the project, not in some course you can buy today hoping to cash in on it tomorrow.
How to position yourself without betting blind
The sensible strategy is the same one as always in this trade: a broad, well-documented profile. Recognised certification, real inspection experience, a solid technical speciality or two, and a well-kept logbook that can prove hours and tasks.
If offshore hydrogen grows, it will hire divers who already know how to work on complex energy installations. If it doesn't grow at the pace expected, that same profile is still employable everywhere else. It's the only way to take advantage of a trend without getting trapped by it.
As a starting point, the usual route is described in the guide on how to train as a commercial diver and the map of markets is in where the work is.
How an inspection campaign is organised on this type of installation
It's worth describing, because this is where the work stops being an idea and becomes a work report. An inspection campaign on an offshore energy installation, whether hydrogen or gas, always follows the same sequence.
First there's a planning phase in which the operator defines what needs checking and against what criteria. Out of that comes a scope with specific points: this flange, this stretch of pipe, these anodes, this weld. Nobody goes down just to look around; they go down with a list.
Then the method is decided. A good part of the inspection is handled by ROV, because it's cheaper and puts nobody at risk. The diver comes in when physical contact is needed: cleaning an area so it can be measured, placing NDT equipment, operating a valve, removing a part.
Then comes execution, with its pre-job briefing, its permit to work and its coordination with the installation's control room. And finally the most underrated phase: the report. On installations of this kind, the value of the work lies as much in what's done as in the quality of what's recorded.
Why this matters for a young diver
Because it explains which skills get paid for. A diver who can explain what they've seen, locate it precisely, record it well and describe it without ambiguity is worth more than one who can only get to the bottom. In new sectors, where the criteria are still settling, that ability stands out even more.
The factor that actually decides whether there'll be work
It isn't the technology. Water electrolysis is a process that's been known for over a century, and offshore engineering knows how to build platforms and lay pipelines. What decides it is economics: whether hydrogen produced at sea ends up competitive against hydrogen produced on land, and whether there's industrial demand willing to pay for it.
That uncertainty is why several announced projects have changed their timeline. And it's also why it's worth being wary of any training sold as a passport to an emerging sector. Emerging sectors hire people who are already trained when they get going; they don't train people in advance.
A useful comparison
Offshore wind went through the same thing. For years it was a promise, then it became an industry that absorbed many divers coming from oil, and today it's a mature market with its own routines. Those divers' way in wasn't a wind-industry course: it was having the usual credentials and being available when the campaigns arrived.
If offshore hydrogen follows that script, the way to be ready is exactly what's described in the guide on how to land your first offshore job: valid certification, availability, contacts at agencies, and a track record you can show.
Questions worth asking before chasing the niche
The first is whether the project has a final investment decision. A project without approved funding is a document, not a job. The second is where it is, because the labour market for a North Sea project doesn't look like one in another region. The third is who the installation and maintenance contractor is, because that's who hires divers, not the project developer.
That last point causes the most confusion. The company that shows up in the news is rarely the one that issues the diving contract. The work comes down the chain of contractors and subcontractors, and you get access to it through crewing agencies and diving companies operating in the area.
In closing
Offshore green hydrogen is a reasonable possibility, and still a small one. It generates the same type of underwater work as the rest of the marine energy sector, doesn't demand new skills, and doesn't justify reorganising a career around it.
The right takeaway is the opposite of what the headlines suggest: you don't need to prepare for hydrogen, you need to prepare well for offshore. If hydrogen arrives, the prepared diver will be on the list. If it doesn't, they'll carry on working just the same.
Frequently asked questions
Is there already commercial diving work in offshore hydrogen?
Very little, and heavily concentrated in pilot and demonstrator projects. Most of the activity is still offshore wind, oil and gas and harbour works. It's worth treating it as an emerging niche, not as an immediate career option.
What extra training does an offshore hydrogen project ask for?
The base is the same: a recognised commercial diving certification, offshore survival training and medical fitness. What changes are the specific process safety and flammable atmosphere courses the installation's operator requires.
Is it dangerous to dive near hydrogen infrastructure?
The hydrogen risk is one of flammability, and it sits at the surface and inside the equipment, not in the usual underwater work. As with any process installation, the real control is the permit to work, isolation and coordination with the control room.
Will hydrogen replace oil as the main employer of divers?
There's no basis for saying that today. The volume of subsea oil and gas infrastructure is still far greater, and much of the future diving work in that sector is decommissioning and maintenance, not new construction.
Is it worth specialising in this niche now?
The sensible approach is to build a solid, generalist profile first (inspection, welding, hydraulic tools) and keep informed. Narrow specialisations in sectors that still have no real volume leave the diver exposed if the project slips.
Published 4 September 2026 · By Arthur More, professional saturation diver
Photo: Markus Trienke · CC BY-SA via Openverse
This article is part of our in-depth guide to how deep a commercial diver can actually go — the complete picture, with sources.
This article is part of our in-depth guide to how deep a commercial diver can actually go — the complete picture, with sources.
This article is part of our in-depth guide to how deep a commercial diver can actually go — the complete picture, with sources.
This article is part of our in-depth guide to how deep a commercial diver can actually go — the complete picture, with sources.