Company lists · Data refreshed September 2026

Top 25 Underwater construction firms worldwide

Name: Underwater construction firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 2,314 companies tracked

RevenueBase identified 2,314 underwater construction firms worldwide as of September 2026 and tracks 81,162 professional contacts across them, including 17,942 with verified work emails and 0 with mobile numbers. The United States is the largest market and Houston the largest hub.

This list covers underwater construction firms worldwide, 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. Country and city lists for underwater construction firms follow the table.

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

2,314Companies

81,162Contacts tracked

17,942Verified emails

0Mobile numbers

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The 25 largest underwater construction firms worldwide

Ranked by team size

Top 25 of 2,314 underwater construction firms worldwide, 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	VAN Oord	Indirect evidence	3063 Nh, NetherlandsHQ checked Sep 19, 2026	5,001-10,000	4,364 contacts →
	Indirect evidence “Van Oord is a leading international marine contractor focusing on dredging, infrastructure and offshore energy projects.” Source: RevenueBase Database · checked Sep 19, 2026
2	Boskalis	Indirect evidence	Papendrecht, NetherlandsHQ checked Sep 19, 2026	10001+	3,366 contacts →
	Indirect evidence “Boskalis is a leading global services provider operating in the dredging, maritime infrastructure and maritime services sectors.” Source: RevenueBase Database · checked Sep 19, 2026
3	Heerema Marine Contractors	Indirect evidence	Leiden, NetherlandsHQ checked Sep 19, 2026	1,001-5,000	2,643 contacts →
	Indirect evidence “Heerema Marine Contractors is a world-leading marine contractor in the international offshore energy industry.” Source: RevenueBase Database · checked Sep 19, 2026
4	Chantiers DE L'atlantique	Partial evidence	Saint-nazaire, FranceHQ checked Sep 19, 2026	1,001-5,000	2,004 contacts →
	Partial evidence “Installée sur la façade Atlantique, Chantiers de l’Atlantique est une entreprise de construction maritime (paquebots, sous-stations…) et de services aux flottes.” Source: RevenueBase Database · checked Sep 19, 2026
5	Grupo CBO	Indirect evidence	Niterói, BrazilHQ checked Sep 19, 2026	1,001-5,000	1,847 contacts →
	Indirect evidence “O Grupo CBO é uma das maiores empresas de apoio marítimo do Brasil.” Source: RevenueBase Database · checked Sep 19, 2026
6	Groupe Ponticelli Frères	Indirect evidence	FranceHQ checked Sep 19, 2026	5,001-10,000	1,829 contacts →
	Indirect evidence “The Ponticelli Frères Group is one of the main European service suppliers to companies in the energy (oil and gas, nuclear, renewable energy), industrial (chemical, steelworks…” Source: RevenueBase Database · checked Sep 19, 2026
7	Deepocean	Indirect evidence	Oslo, NorwayHQ checked Sep 19, 2026	1,001-5,000	1,375 contacts →
	Indirect evidence “DeepOcean is a technology-driven, independent solution provider in the ocean space.” Source: RevenueBase Database · checked Sep 19, 2026
8	CCC Underwater Engineering S.A.L	Partial evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 19, 2026	201-500	1,279 contacts →
	Partial evidence “(Underwater Engineering) S.A.L was established in 1976.” Source: RevenueBase Database · checked Sep 19, 2026
9	BELOV	Indirect evidence	Matriz, BrazilHQ checked Sep 19, 2026	1,001-5,000	1,108 contacts →
	Indirect evidence “A Belov Engenharia foi criada em 1981 em Salvador/BA, pelo engenheiro Aleixo Belov, que à época desfrutava de uma experiência de 15 anos de participação na condução das maiores…” Source: RevenueBase Database · checked Sep 19, 2026
10	Great Lakes Dredge & Dock Company, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	916 contacts →
	Indirect evidence “Great Lakes Dredge & Dock (GLDD) is the largest provider of dredging services in the United States and the only U.S.” Source: RevenueBase Database · checked Sep 19, 2026
11	Bollinger Shipyards	Partial evidence	Lockport, United StatesHQ checked Sep 19, 2026	5,001-10,000	853 contacts →
	Partial evidence “Bollinger Shipyards is the leading provider of quality new construction, repair and conversion products and services to both the military and commercial marine industry.” Source: RevenueBase Database · checked Sep 19, 2026
12	Weeks Marine, INC	Indirect evidence	Cranford, NJ, United StatesHQ checked Sep 19, 2026	1,001-5,000	847 contacts →
	Indirect evidence “Founded in 1919, Weeks Marine, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
13	Micoperi SRL	Indirect evidence	Ravenna, ItalyHQ checked Sep 19, 2026	201-500	841 contacts →
	Indirect evidence “MICOPERI has been active in the marine sector since 1946 when the company was incorporated as a salvage company to free the shipping routes from vessels sunk during the Second…” Source: RevenueBase Database · checked Sep 19, 2026
14	C-Innovation, LLC	Indirect evidence	Mandeville, LA, JamaicaHQ checked Sep 19, 2026	201-500	823 contacts →
	Indirect evidence “YOUR SINGLE SOURCE FOR SUBSEA SOLUTIONS FROM EQUIPMENT TO EXPERIENCE, C-INNOVATION IS THE SUBSEA SOLUTION C-Innovation (C-I) is an integrated marine services company specializing…” Source: RevenueBase Database · checked Sep 19, 2026
15	Allianz Middle East Ship Management LLC	Indirect evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 19, 2026	1,001-5,000	793 contacts →
	Indirect evidence “With offices in Abu Dhabi, Dubai, Qatar and Singapore, Allianz Middle East Ship Management LLC(Allianz-ME) is a well-established marine contractors providing modern Offshore…” Source: RevenueBase Database · checked Sep 19, 2026
16	Kuiper Group	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 19, 2026	1,001-5,000	699 contacts →
	Indirect evidence “Kuiper Group, part of Oilmax Group, is a leading integrated manpower services provider supporting the global Oil & Gas industry since We enable critical energy operations through…” Source: RevenueBase Database · checked Sep 19, 2026
17	Unique Group	Indirect evidence	Sharjah, United Arab EmiratesHQ checked Sep 19, 2026	501-1,000	618 contacts →
	Indirect evidence “Unique Group is a leading specialist and integrated engineering solutions provider across the global subsea, renewables, oil and gas, and defence industries.” Source: RevenueBase Database · checked Sep 19, 2026
18	Empresa Constructora Belfi S.A	Indirect evidence	Santiago, ChileHQ checked Sep 19, 2026	1,001-5,000	594 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
19	Manson Construction CO	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	501-1,000	592 contacts →
	Partial evidence “Manson is one of the nation’s leading heavy civil marine construction and dredging companies.” Source: RevenueBase Database · checked Sep 19, 2026
20	Construtora Vale Verde S A	Indirect evidence	Itabira, BrazilHQ checked Sep 19, 2026	1,001-5,000	555 contacts →
	Indirect evidence “A Construtora Vale Verde é uma empresa inovadora que concentra a sua expertise na atuação em soluções para construção civil pesada com serviços de dragagem convencional e…” Source: RevenueBase Database · checked Sep 19, 2026
21	Seagems	Indirect evidence	Rio De Janeiro - Rj, IndiaHQ checked Sep 19, 2026	1,001-5,000	545 contacts →
	Indirect evidence “Seagems is a Brazilian company specialized in subsea services, a joint venture between two international key players in their markets, Paratus Energy and Vantris Energy.” Source: RevenueBase Database · checked Sep 19, 2026
22	Island Offshore	Indirect evidence	Ulsteinvik, NorwayHQ checked Sep 19, 2026	501-1,000	501 contacts →
	Indirect evidence “Island Offshore - The Island Offshore Group is a leading provider of services to the offshore industry ranging from Platform Supply, Walk-to-work and Anchor Handling to Advanced…” Source: RevenueBase Database · checked Sep 19, 2026
23	Global Maritime	Indirect evidence	Stavanger, NorwayHQ checked Sep 19, 2026	201-500	472 contacts →
	Indirect evidence “Global Maritime delivers integrated marine solutions for a changing offshore world.” Source: RevenueBase Database · checked Sep 19, 2026
24	Reach Subsea	Indirect evidence	Haugesund, NorwayHQ checked Sep 19, 2026	201-500	454 contacts →
	Indirect evidence “Reach Subsea ASA (“Reach Subsea”, “Reach” or “the Group”) is a prominent offshore contractor that offer high quality solutions and technology to clients in need of ocean data and…” Source: RevenueBase Database · checked Sep 19, 2026
25	Ammico International Contracting Co. LTD	Indirect evidence	Jeddah, Saudi ArabiaHQ checked Sep 19, 2026	1,001-5,000	418 contacts →
	Indirect evidence “Ammico is a geotechnical specialist contracting company and specializes in foundation engineering and marine works.” 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 2,314 underwater construction firms worldwide

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Underwater construction firms worldwide at a glance

As of Sep 19, 2026

22.1%Verified-email coverage

35.1Average contacts per company

11-50Median size (employees)

1.6%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

756

11-50

876

51-200

426

201-500

143

501-1,000

1,001-5,000

5,001-10,000

10001+

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.
Coverage: 20 countries, largest first: the United States, the United Kingdom, the Netherlands, Brazil, the United Arab Emirates, Australia, Norway, Italy, India, Canada and 10 more. Country and city lists for underwater construction firms are linked below.
What qualifies: Companies worldwide 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.
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, 17,942 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.

Underwater construction firms by location

20 lists · largest first

Every Underwater construction firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 worldwide?

RevenueBase identified 2,314 underwater construction firms worldwide 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?

VAN Oord, headquartered in Rotterdam, tops this list with the largest team on record.

Which country has the most underwater construction firms?

The United States leads with 751 companies, followed by the United Kingdom (262) and the Netherlands (128). Every underwater construction firms list by country and city is linked on this page.

Which city has the most underwater construction firms?

Houston leads with 38 headquartered companies, followed by Dubai (30) and Mumbai (27).

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 17,942 verified decision-maker contacts tracked across these 2,314 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.

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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.