Company lists · Data refreshed September 2026

Top 25 Underwater construction firms based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 262 companies tracked

RevenueBase identified 262 underwater construction firms headquartered in the United Kingdom as of September 2026 and tracks 6,900 professional contacts across them, including 2,188 with verified work emails. Aberdeen is the largest hub.

This list covers underwater construction firms 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 19, 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 19, 2026 86% judged on-target in blind review

262Companies

6,900Contacts tracked

2,188Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest underwater construction firms based in the United Kingdom

Ranked by team size

Top 25 of 262 underwater construction firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to underwater construction firms: 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	Boskalis Subsea Services	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 19, 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 19, 2026
2	Boskalis Westminster LTD	Indirect evidence	Fareham, United KingdomHQ checked Sep 19, 2026	51-200	363 contacts →
	Indirect evidence “Boskalis Westminster Ltd (BWL) is the leading dredging contractor in the UK and Ireland.” Source: RevenueBase Database · checked Sep 19, 2026
3	Global Marine	Indirect evidence	Chelmsford, United KingdomHQ checked Sep 19, 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 19, 2026
4	Enshore Subsea	Indirect evidence	Blyth, United KingdomHQ checked Sep 19, 2026	51-200	161 contacts →
	Indirect evidence “The globally trusted delivery experts in installing and protecting critical subsea infrastructure.” Source: RevenueBase Database · checked Sep 19, 2026
5	Ferguson Marine Port Glasgow Limited	Indirect evidence	Port Glasgow, United KingdomHQ checked Sep 19, 2026	201-500	156 contacts →
	Indirect evidence “Ferguson Marine (Port Glasgow) Limited is Scotland's leading company in new build, refit and ship repair.” Source: RevenueBase Database · checked Sep 19, 2026
6	Interocean Marine Services	Indirect evidence	Portlethen, United KingdomHQ checked Sep 19, 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 19, 2026
7	Aquaterra Group LTD	Indirect evidence	Kintore, United KingdomHQ checked Sep 19, 2026	11-50	123 contacts →
	Indirect evidence “RELIABLE \| RESOURCEFUL \| READY We continually raise the bar by challenging ourselves and our clients to enable safe and efficient performance.” Source: RevenueBase Database · checked Sep 19, 2026
8	James Fisher Offshore	Indirect evidence	Oldmeldrum, United KingdomHQ checked Sep 19, 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 19, 2026
9	Modutec	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 19, 2026	51-200	103 contacts →
	Indirect evidence “Repair, Conversion and New Build of Marine and Offshore Living Quarters and Technical Buildings.” Source: RevenueBase Database · checked Sep 19, 2026
10	SMS Group Ship Repair Marine Interiors Marine Engineering SC Sqep	Indirect evidence	Southampton, United KingdomHQ checked Sep 19, 2026	51-200	89 contacts →
	Indirect evidence “Southampton Marine Services Ltd was established in 2004 and specialises in ship / work boat building, vessel repair and marine engineering; we trade in four markets - Commercial…” Source: RevenueBase Database · checked Sep 19, 2026
11	Shearwater Marine Services	Indirect evidence	Sandbank, United KingdomHQ checked Sep 19, 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 19, 2026
12	Foundocean	Partial evidence	Livingston, United KingdomHQ checked Sep 19, 2026	51-200	85 contacts →
	Partial evidence “FoundOcean boasts 60 years’ experience of providing green and brown field services to the marine construction industries.” Source: RevenueBase Database · checked Sep 19, 2026
13	JEE	Indirect evidence	Tonbridge, United KingdomHQ checked Sep 19, 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 19, 2026
14	Holyhead Towing Co. LTD	Indirect evidence	Holyhead, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Indirect evidence “Holyhead Towing Company (Est.” Source: RevenueBase Database · checked Sep 19, 2026
15	TMS LTD	Indirect evidence	Devon, United KingdomHQ checked Sep 19, 2026	51-200	65 contacts →
	Indirect evidence “TMS Ltd have in excess of 31 years of expertise as a marine contractor within the Civil Engineering sector.” Source: RevenueBase Database · checked Sep 19, 2026
16	Offshore Marine Management Holdings LTD	Indirect evidence	Bristol, United KingdomHQ checked Sep 19, 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 19, 2026
17	Afslowestoft	Indirect evidence	Lowestoft, United KingdomHQ checked Sep 19, 2026	51-200	54 contacts →
	Indirect evidence “AFS Ltd is an independently owned manufacturing company.” Source: RevenueBase Database · checked Sep 19, 2026
18	GMC Limited	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 19, 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 19, 2026
19	Land And Marine Engineering Limited	Partial evidence	Bromborough, United KingdomHQ checked Sep 19, 2026	201-500	52 contacts →
	Partial 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 19, 2026
20	Dales Engineering Services LTD	Indirect evidence	Peterhead, United KingdomHQ checked Sep 19, 2026	51-200	49 contacts →
	Indirect evidence “Since its inception in 1987, Dales Engineering Services Ltd has been providing fabrication, welding and machining solutions to both the onshore and offshore sectors.” Source: RevenueBase Database · checked Sep 19, 2026
21	KD Marine LTD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 19, 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 19, 2026
22	Edwards Diving Services LTD	Indirect evidence	Pontypridd, United KingdomHQ checked Sep 19, 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 19, 2026
23	GPS Marine Contractors LTD	Partial evidence	Rochester, United KingdomHQ checked Sep 19, 2026	51-200	44 contacts →
	Partial evidence “Marine Contractors specialising in: Marine Civil Engineering and Construction.” Source: RevenueBase Database · checked Sep 19, 2026
24	Southbay Civil Engineering LTD	Indirect evidence	Gateshead, United KingdomHQ checked Sep 19, 2026	51-200	43 contacts →
	Indirect evidence “Over the last 20 years Southbay has developed a reputation as one of the UK’s leading maritime civil engineering contractors, undertaking technically challenging projects within…” Source: RevenueBase Database · checked Sep 19, 2026
25	First Subsea	Indirect evidence	Lancaster, United KingdomHQ checked Sep 19, 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 19, 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 construction firms. 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 construction firms.
Partial evidence: Its own public description names part of underwater construction firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name underwater construction firms. 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 262 underwater construction firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,188 reachable decision-makers.

Free signup · no credit card

View the full list →

Underwater construction firms based in the United Kingdom at a glance

As of Sep 19, 2026

31.7%Verified-email coverage

26.3Average contacts per company

11-50Median size (employees)

9.2%Largest-city concentration · Aberdeen

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

114

11-50

51-200

201-500

501-1,000

1,001-5,000

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 262 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 construction firms, 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 construction firms”. 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 construction firms), 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 construction firms, 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, 2,188 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 19, 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.

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 construction firms, 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 construction firms are there based in the United Kingdom?

RevenueBase identified 262 underwater construction firms 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?

Boskalis Subsea Services, headquartered in Aberdeen, tops this list with the largest team on record.

Which city has the most underwater construction firms?

Aberdeen leads with 24 headquartered companies, followed by London (16) 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 2,188 verified decision-maker contacts tracked across these 262 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 19, 2026.

Ready to reach these companies? Verified emails and direct dials for all 262 underwater construction firms based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Underwater construction firms by geography

Browse the directory

Browse: Companies home · All United Kingdom lists · All Underwater construction firms lists · New lists

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.