Company lists · Data refreshed September 2026

Top 25 Underwater infrastructure companies based in the United Kingdom

Name: Underwater infrastructure companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 228 companies tracked

RevenueBase identified 228 underwater infrastructure companies headquartered in the United Kingdom as of September 2026 and tracks 8,966 professional contacts across them, including 3,461 with verified work emails. Aberdeen is the largest hub.

This list covers underwater infrastructure companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 22, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 22, 2026 86% judged on-target in blind review

228Companies

8,966Contacts tracked

3,461Verified emails

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The 25 largest underwater infrastructure companies based in the United Kingdom

Ranked by team size

Top 25 of 228 underwater infrastructure companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to underwater infrastructure companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Altera Infrastructure	Partial evidence	Aberdeenshire, United KingdomHQ checked Sep 22, 2026	501-1,000	955 contacts →
	Partial evidence “Altera Infrastructure is a leading global energy infrastructure services group focused on the ownership and operation of offshore energy assets.” Source: RevenueBase Database · checked Sep 22, 2026
2	Barhale LTD	Indirect evidence	Walsall, United KingdomHQ checked Sep 22, 2026	1,001-5,000	803 contacts →
	Indirect evidence “Barhale was formed in 1980 as a specialist tunnelling contractor and grew initially through the successful delivery of projects in the water sector, developing mechanical and…” Source: RevenueBase Database · checked Sep 22, 2026
3	Boskalis Subsea Services	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 22, 2026	201-500	516 contacts →
	Indirect evidence “Boskalis Subsea Services is a world-leading provider of specialist subsea solutions for the offshore energy industry, seamlessly integrating services to deliver optimum results.” Source: RevenueBase Database · checked Sep 22, 2026
4	Global Marine	Indirect evidence	Chelmsford, United KingdomHQ checked Sep 22, 2026	501-1,000	339 contacts →
	Indirect evidence “Global Marine is part of the Global Marine Group, and is a market leader in subsea cable installation and maintenance solutions to the telecoms and oil & gas sectors.” Source: RevenueBase Database · checked Sep 22, 2026
5	SMD	Indirect evidence	Wallsend, United KingdomHQ checked Sep 22, 2026	51-200	292 contacts →
	Indirect evidence “SMD is an advanced global designer and manufacturer of subsea remotely operated and autonomous power and control solutions.” Source: RevenueBase Database · checked Sep 22, 2026
6	Radius Systems	Indirect evidence	South Normanton, United KingdomHQ checked Sep 22, 2026	201-500	195 contacts →
	Indirect evidence “Part of Radius Group Holdings, Radius Systems is proud to be the pipeline experts for the gas, water, energy, power and telecoms sectors.” Source: RevenueBase Database · checked Sep 22, 2026
7	Acteon	Partial evidence	Norwich, United KingdomHQ checked Sep 22, 2026	1,001-5,000	192 contacts →
	Partial evidence “Acteon delivers data-driven, engineering-led solutions across the lifecycle of offshore energy infrastructure.” Source: RevenueBase Database · checked Sep 22, 2026
8	OSBIT	Indirect evidence	Northumberland, United KingdomHQ checked Sep 22, 2026	201-500	171 contacts →
	Indirect evidence “Osbit’s vision is to unlock a clean energy future by creating smarter technology.” Source: RevenueBase Database · checked Sep 22, 2026
9	Enshore Subsea	Partial evidence	Blyth, United KingdomHQ checked Sep 22, 2026	51-200	161 contacts →
	Partial evidence “The globally trusted delivery experts in installing and protecting critical subsea infrastructure.” Source: RevenueBase Database · checked Sep 22, 2026
10	Interocean Marine Services	Indirect evidence	Portlethen, United KingdomHQ checked Sep 22, 2026	51-200	134 contacts →
	Indirect evidence “Interocean provide a comprehensive range of services to the offshore oil and gas, marine, and renewable sectors.” Source: RevenueBase Database · checked Sep 22, 2026
11	James Fisher Offshore	Indirect evidence	Oldmeldrum, United KingdomHQ checked Sep 22, 2026	51-200	107 contacts →
	Indirect evidence “James Fisher Offshore (JFO) is an international supplier of marine back deck, specialist subsea equipment and engineering services supporting the global subsea contractors across…” Source: RevenueBase Database · checked Sep 22, 2026
12	Shearwater Marine Services	Indirect evidence	Sandbank, United KingdomHQ checked Sep 22, 2026	51-200	87 contacts →
	Indirect evidence “Founded in 1992, Shearwater Marine Services have since grown to become a highly respected topside and sub-surface marine engineering service provider.” Source: RevenueBase Database · checked Sep 22, 2026
13	Foundocean	Indirect evidence	Livingston, United KingdomHQ checked Sep 22, 2026	51-200	85 contacts →
	Indirect evidence “FoundOcean boasts 60 years’ experience of providing green and brown field services to the marine construction industries.” Source: RevenueBase Database · checked Sep 22, 2026
14	JEE	Indirect evidence	Tonbridge, United KingdomHQ checked Sep 22, 2026	51-200	77 contacts →
	Indirect evidence “Jee is a leading independent multi-discipline subsea engineering and training company, delivering integrated services to the oil, gas and renewables industries.” Source: RevenueBase Database · checked Sep 22, 2026
15	Hydro Group Ltd, Connected By Trexon	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 22, 2026	51-200	71 contacts →
	Indirect evidence “With over 40 years of experience, at Hydro Group we specialise in the manufacture of bespoke subsea cable and connector assembly engineering for some of the most demanding…” Source: RevenueBase Database · checked Sep 22, 2026
16	Global Marine Group	Indirect evidence	Chelmsford, United KingdomHQ checked Sep 22, 2026	51-200	70 contacts →
	Indirect evidence “The Global Marine Group is a leading independent provider of submarine cable solutions offering a broad range of services including consultancy, installation and maintenance…” Source: RevenueBase Database · checked Sep 22, 2026
17	Film-Ocean	Indirect evidence	Ellon, United KingdomHQ checked Sep 22, 2026	51-200	68 contacts →
	Indirect evidence “Film-Ocean provides innovative subsea solutions to the global offshore energy industry.” Source: RevenueBase Database · checked Sep 22, 2026
18	Offshore Marine Management Holdings LTD	Indirect evidence	Bristol, United KingdomHQ checked Sep 22, 2026	11-50	60 contacts →
	Indirect evidence “Offshore Marine Management Holdings is a leading group of companies specialising in the delivery of subsea solutions to the offshore renewables, grid, telecommunications and oil &…” Source: RevenueBase Database · checked Sep 22, 2026
19	SRP	Indirect evidence	Woking, United KingdomHQ checked Sep 22, 2026	11-50	56 contacts →
	Indirect evidence “We design and supply products for the offshore and subsea industries; specialising in subsea and riser applications enduring fatigue, high strength steel and moving parts.” Source: RevenueBase Database · checked Sep 22, 2026
20	GMC Limited	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 22, 2026	11-50	54 contacts →
	Indirect evidence “GMC Limited is an engineering, products, and services company specialising in the connection of tubular structures for offshore and subsea applications.” Source: RevenueBase Database · checked Sep 22, 2026
21	Land And Marine Engineering Limited	Indirect evidence	Bromborough, United KingdomHQ checked Sep 22, 2026	201-500	52 contacts →
	Indirect evidence “Land and Marine Engineering Limited, a part of the Murphy Group of companies is an international engineering and construction company.” Source: RevenueBase Database · checked Sep 22, 2026
22	KD Marine LTD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 22, 2026	11-50	48 contacts →
	Partial evidence “KD Marine are a commercial diving contractor providing underwater intervention services to the offshore oil and gas industry.” Source: RevenueBase Database · checked Sep 22, 2026
23	Edwards Diving Services LTD	Indirect evidence	Pontypridd, United KingdomHQ checked Sep 22, 2026	51-200	46 contacts →
	Indirect evidence “EDWARDS DIVING SERVICES LIMITED (EDS) is a specialist Marine & Civil Engineering company located in South Wales, United Kingdom.” Source: RevenueBase Database · checked Sep 22, 2026
24	GPS Marine Contractors LTD	Indirect evidence	Rochester, United KingdomHQ checked Sep 22, 2026	51-200	44 contacts →
	Indirect evidence “Marine Contractors specialising in: Marine Civil Engineering and Construction.” Source: RevenueBase Database · checked Sep 22, 2026
25	First Subsea	Indirect evidence	Lancaster, United KingdomHQ checked Sep 22, 2026	51-200	41 contacts →
	Indirect evidence “With over 30 years' experience; First Subsea are a trusted provider of subsea products for the offshore wind, oil and gas industries.” Source: RevenueBase Database · checked Sep 22, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: underwater infrastructure companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names underwater infrastructure companies.
Partial evidence: Its own public description names part of underwater infrastructure companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name underwater infrastructure companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 228 underwater infrastructure companies based in the United Kingdom

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Underwater infrastructure companies based in the United Kingdom at a glance

As of Sep 22, 2026

38.6%Verified-email coverage

39.3Average contacts per company

11-50Median size (employees)

14.0%Largest-city concentration · Aberdeen

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

100

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 228 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among underwater infrastructure companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “underwater infrastructure companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names underwater infrastructure companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among underwater infrastructure companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 3,461 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 22, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Underwater infrastructure companies by metro

Underwater infrastructure companies in Aberdeen32

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names underwater infrastructure companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many underwater infrastructure companies are there based in the United Kingdom?

RevenueBase identified 228 underwater infrastructure companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Altera Infrastructure, headquartered in Prospect Park, tops this list with the largest team on record.

Which city has the most underwater infrastructure companies?

Aberdeen leads with 32 headquartered companies, followed by London (14) and Ellon (5).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 3,461 verified decision-maker contacts tracked across these 228 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 22, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.