The global map of commercial diving, counted

876 companies, 59 countries, and two of them hold a quarter

Ask where the commercial diving industry is and you get a list of seas rather than a list of countries: the North Sea, the Gulf of Mexico, the Persian Gulf, West Africa, Southeast Asia. That describes where the work happens, not where the companies are, and the two are not the same thing.

Our company directory holds 876 companies across 59 countries, each one filed under the country it gives as its own base and under one of four categories: contractor, equipment supplier, crewing agency or operator. Counted that way, the industry is far more concentrated than the list of seas suggests. A quarter of it sits in two countries. Half of it sits in ten. The rest share what is left, and a good number of them appear exactly once.

The United States has 143 entries and the United Kingdom has 92. Together that is 26.8% of the directory, which is a remarkable share for two countries out of 59. Extend the list to the first ten and you reach 54.5%: the United States, the United Kingdom, Spain, the United Arab Emirates, Canada, Norway, Brazil, India, the Netherlands and Australia. The chart below shows how steeply the ranking falls away after the first two entries, and where Spain lands on it.

Some of that concentration is real industrial weight. The United States has the Gulf of Mexico, a large inland and harbour diving market, and a long-established equipment manufacturing base — 100 of its 143 entries are contractors and 38 are equipment suppliers. The United Kingdom's 92 split differently: 33 contractors, 33 equipment suppliers, 24 crewing agencies and 2 operators. That is the profile of a country that has become a place where offshore diving is organised and supplied as much as a place where it is performed, which is roughly what you would expect from fifty years of North Sea work. We compare the two basins directly in the North Sea against the Gulf of Mexico.

The rest of the concentration is language and web presence. A directory built by reading what companies publish over-counts countries where firms publish in English and expect foreign clients, and under-counts countries where contracts come through relationships rather than search results. Both effects push the same way as the real industrial pattern, which makes them hard to separate.

Spain is third, and that is not an offshore story

Spain's 67 entries make it the third country in the directory, ahead of the United Arab Emirates, Norway and Brazil. Taken at face value that looks like a claim that Spain is a major offshore diving nation, which it is not.

The category breakdown explains it. 62 of Spain's 67 entries are contractors, 4 are equipment suppliers and 1 is an operator. There is no crewing agency at all. That is the shape of a large domestic market for inland and coastal work — port inspection, hull cleaning, dams, civil works, aquaculture, salvage — served by many small firms with their own sites rather than a few large offshore contractors. Compare Norway: 27 entries in total, but 19 contractors, 5 equipment suppliers and 1 operator.

The same caution applies to Portugal's 18 entries, to Greece's 16 and to Italy's 15, of which 6 are equipment suppliers and 1 an operator. None of those counts tells you how much work the companies do or whether any of them has ever put a diver in saturation. The directory counts companies, not activity, and a one-person harbour contractor counts the same as a firm running several dive support vessels.

Crewing is the most concentrated thing in the directory

Of the 876 companies, only 44 are crewing agencies, and their geography is the tightest in the whole dataset. 24 of those 44 are registered in the United Kingdom, and in practice most of them are in or around Aberdeen. After that the numbers are tiny: the Philippines has 4, then the United States, Hong Kong, the Netherlands and Cyprus have 3 each, Norway has 2 and Australia 1.

The second chart sets that beside the other three categories, so the difference is visible at a glance.

The likeliest reading is that crewing sits where the contracts are written rather than where the divers live, and for saturation work in the eastern Atlantic those contracts have been written in Aberdeen for decades. The Philippines points the other way: a country that supplies offshore marine crew worldwide and has agencies set up to do it. Hong Kong and Cyprus are more likely ship-management convention than diving activity — an interpretation of the pattern, not something the directory states. If you want work rather than a map, our jobs and crewing agencies page is the practical version of this list.

The operator category is smaller still, at 15 companies: the United Kingdom and the United States have 2 each, and the United Arab Emirates, Italy, Norway, Spain, Brazil and Malaysia 1 each. We use it for companies that operate assets rather than sell diving as a service, and at 15 entries it is too small to support any geographic claim.

Equipment has two capitals and a long thin tail

The directory holds 139 equipment suppliers, and 38 of them are in the United States and 33 in the United Kingdom. No third country comes close: Canada has 9, Italy 6, Norway and Sweden 5 each, Spain 4 and France 3. The making and selling of helmets, umbilicals, chambers, panels, compressors and bell hardware has stayed in a small number of places.

Sweden is worth pausing on: 5 of its 17 entries are equipment suppliers, a high proportion for a country with no offshore diving industry of its own. The plainest reading is specialist manufacturing selling into an international market, but the directory does not record what each supplier makes, so we cannot confirm it.

Source: satdiver.com company directory, read 28 September 2026.

Contracting is where the volume is: 678 of the 876 companies are contractors, which is why the overall country ranking is largely a ranking of contractors. The top contractor countries are the United States with 100, Spain with 62, the United Kingdom with 33, the United Arab Emirates with 26, India with 23, Brazil with 23, Norway with 19 and Canada with 18. Notice the United Kingdom is third here, not second: its overall position is carried by equipment and crewing, not by contractors.

The countries that barely appear

The interesting part of a concentrated map is usually the thin end. Nigeria has 16 entries, which is low for a country with the offshore history of the Niger Delta. Indonesia has 14 and Singapore 15 between them for Southeast Asia. Mexico has 15, South Korea 15, Germany 13. And then the list runs out: Angola, Czechia and Namibia each hold one company, and so do six labels that name two countries at once.

Those six are worth explaining rather than glossing over. The directory records the country a company publishes as its base, and six companies publish two: "Canada / United States", "Germany / United States", "Luxembourg / Belgium", "Luxembourg / UK", "Switzerland / Netherlands" and "United Kingdom / United States". That is usually a registered office in one place and working operations in another, and we file it as published rather than choosing one for them. A single company, Unique Group, gives no country at all and is filed as "Global". So the directory carries 66 distinct country labels: 59 that name one country, 6 that name two, and one "Global".

Source: satdiver.com company directory, 876 companies in 59 countries, read 28 September 2026.

Nigeria's 16 is the clearest case of a gap in our reading rather than in the industry. Where work is subcontracted to local firms that do not market internationally, or the operating company is registered elsewhere, a country-of-base count credits the head office and not the seabed — flattening exactly the regions where the offshore industry has grown most recently.

What the map looks like once you ask about saturation

Everything above counts companies of every kind. Narrow the question to saturation — living under pressure in a chamber system for days at a time, transferring to the work in a closed bell — and the map collapses. Only 13 countries in the directory contain even one company that publishes that it operates saturation systems. The large majority of the 59 contain none at all.

That is the sharpest concentration in anything we have counted, and it is not surprising once you consider the cost of owning and crewing a saturation spread. A company can be a competent diving contractor with compressors, surface-supplied equipment and a workboat. A saturation system, or a vessel to carry one, is a different order of capital, and it stays with a small number of firms in a small number of places. We name them in the companies that run saturation.

One caveat: we count a company as saturation-capable only when it publishes that it operates saturation systems itself. A contractor that charters a saturation vessel for a job, which is normal practice, is not counted. So 13 is a count of where the capability is owned and advertised, not where saturation diving happens.

How we counted this

Every figure in this post comes from satdiver's own company directory, read on 28 September 2026. At that date it held 876 company records under 66 distinct country labels: 59 labels that name a single country, 6 that name two because the company publishes two bases, and one "Global". Where this post says "countries" it means the 59; where it says "labels" it means the 66. Each record is filed under one label — the base the company gives — and under exactly one of four categories: contractor (678 records), equipment supplier (139), crewing agency (44) or operator (15). The share figures, 26.8% for the top two countries and 54.5% for the top ten, are proportions of all 876.

The directory is compiled by reading what companies publish about themselves. It is not a register, a licence list or a trade-body membership roll, and nobody has audited it against one. That produces four limitations.

First, visibility bias. A company with an English-language website that wants international clients is far more likely to be in here than a local firm working on referral. That inflates English-speaking and export-oriented countries by an amount we cannot quantify.

Second, the dual-base labels. Six companies publish two countries and one publishes none, so their entries sit outside the 59 single-country totals rather than being forced into one of them. We report the field as published, because assigning those companies to one country each would mean judgement calls we cannot verify.

Third, country of base is not country of work. A contractor registered in the Netherlands working year-round off West Africa counts as Dutch here, so reading this data as "where diving happens" credits head offices over field countries.

Fourth, one record is one company regardless of size. A firm with several vessels is one entry; so is a two-person harbour inspection business. None of the counts above are weighted by revenue, headcount or activity, because the directory does not hold those fields. A related audit of what companies do and do not publish is in our contact transparency audit.

The figures will move as companies are added, close or merge. If you find an error, tell us and we will check it.

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