Company lists · Data refreshed September 2026

Top 24 Underwater construction firms based in France

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 84 companies tracked

RevenueBase identified 84 underwater construction firms headquartered in France as of September 2026 and tracks 6,550 professional contacts across them, including 1,859 with verified work emails. La Ciotat is the largest hub.

This list covers underwater construction firms headquartered in France, 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

84Companies

6,550Contacts tracked

1,859Verified emails

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The 24 largest underwater construction firms based in France

Ranked by team size

Top 24 of 84 underwater construction firms based in France, 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	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
2	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
3	Orange Marine	Indirect evidence	Paris, FranceHQ checked Sep 19, 2026	201-500	219 contacts →
	Indirect evidence “Orange Marine, a wholly-owned subsidiary of the Orange Group, is a cable ship owner specialized in offshore work on submarine cables, from designing and engineering new projects…” Source: RevenueBase Database · checked Sep 19, 2026
4	Geocean	Indirect evidence	Cassis, FranceHQ checked Sep 19, 2026	n/a	216 contacts →
	Indirect evidence “GEOCEAN is a marine work contractor, based near Marseille, in the south of France, with 30 years experience worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
5	Hydrokarst	Indirect evidence	Sassenage, FranceHQ checked Sep 19, 2026	201-500	170 contacts →
	Indirect evidence “HYDROKARST joins JARNIAS GROUP!” Source: RevenueBase Database · checked Sep 19, 2026
6	Nouvetra-Serfim OA	Indirect evidence	Janneyrias, FranceHQ checked Sep 19, 2026	51-200	68 contacts →
	Indirect evidence “L’entreprise NOUVETRA, est localisée à l’Est de Lyon : Adresse : 609 chemin de Salonique 38220 JANNEYRIAS Sur ce site est regroupé l’ensemble du personnel administratif et…” Source: RevenueBase Database · checked Sep 19, 2026
7	Louis Dreyfus Travocean	Indirect evidence	La Ciotat, FranceHQ checked Sep 19, 2026	51-200	38 contacts →
	Indirect evidence “La Société a été créée à Marseille en 1977 pour répondre à la demande dans les travaux maritimes.” Source: RevenueBase Database · checked Sep 19, 2026
8	Watertracks	Indirect evidence	Perols, FranceHQ checked Sep 19, 2026	11-50	28 contacts →
	Indirect evidence “Ingénierie et services subaquatiques robotisés.” Source: RevenueBase Database · checked Sep 19, 2026
9	TETIS	Indirect evidence	Bellevigny, FranceHQ checked Sep 19, 2026	11-50	27 contacts →
	Indirect evidence “Depuis 25 ans l'entreprise TETIS, filiale du Groupe ETPO, est spécialisée dans les domaines des travaux subaquatiques, maritimes et fluviaux.” Source: RevenueBase Database · checked Sep 19, 2026
10	Mareal	Indirect evidence	L'haÿ-les-roses, FranceHQ checked Sep 19, 2026	11-50	25 contacts →
	Indirect evidence “Mareal: Engineering the Future of Offshore Innovation Since its inception in 2002, Mareal has established itself as a leading force in offshore engineering, spanning the entire…” Source: RevenueBase Database · checked Sep 19, 2026
11	SATIF	Indirect evidence	Dagneux, FranceHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “Les travaux subaquatiques sont le cœur d’intervention des scaphandriers de Satif.” Source: RevenueBase Database · checked Sep 19, 2026
12	D2m Engineering	Indirect evidence	Six Fours Les Plages, FranceHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “At d2m, our expert team of marine engineers, naval architects, and offshore contractors have been committed to crafting innovative solutions for complex maritime projects for over…” Source: RevenueBase Database · checked Sep 19, 2026
13	Lecamus	Partial evidence	La Rochelle, FranceHQ checked Sep 19, 2026	11-50	14 contacts →
	Partial evidence “LECAMUS a une activité principale de réparation et de construction navale.” Source: RevenueBase Database · checked Sep 19, 2026
14	TES Technifor	Indirect evidence	Gondreville, FranceHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Aujourd’hui acteur majeur des travaux spéciaux dans tout le quart Nord Est de la France, T.E.S.(Travaux Entretien Subaquatiques) fut fondée en 1982 par Patrick CHAMPLON à Toul.” Source: RevenueBase Database · checked Sep 19, 2026
15	Kappa Offshore Solutions	Indirect evidence	St-Nazaire, FranceHQ checked Sep 19, 2026	1-10	12 contacts →
	Indirect evidence “Kappa Offshore Solutions is a marine engineering company specialized in offshore seismic data acquisition.” Source: RevenueBase Database · checked Sep 19, 2026
16	Bonnavion Secure System	Partial evidence	Firminy, FranceHQ checked Sep 19, 2026	11-50	10 contacts →
	Partial evidence “BONNAVION Secure System intègre les technologies de la construction mécanique et du soudage dans vos projets à dimension stratégique impliquant un management des interfaces…” Source: RevenueBase Database · checked Sep 19, 2026
17	Oppy International	Indirect evidence	Nantes, FranceHQ checked Sep 19, 2026	1-10	8 contacts →
	Indirect evidence “Oppy International is a consulting firm specializing in marine projects, focusing on naval systems, maritime infrastructure, and floating structures across Europe, Canada, and…” Source: RevenueBase Database · checked Sep 19, 2026
18	Novawell	Indirect evidence	Montpellier, FranceHQ checked Sep 19, 2026	11-50	7 contacts →
	Indirect evidence “NOVAWELL provides subsea technologies and services to the oil and gas industry, including pre-commissioning, inspection, maintenance and repair of subsea umbilicals, risers…” Source: RevenueBase Database · checked Sep 19, 2026
19	TSM Soudure	Indirect evidence	Puceul, FranceHQ checked Sep 19, 2026	1-10	7 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
20	Jifmar Group	Indirect evidence	Aix En Provence, FranceHQ checked Sep 19, 2026	201-500	7 contacts →
	Indirect evidence “Operating a modern fleet of vessels with highly qualified and seasoned personnel, Jifmar provides assistance to - Offshore Wind Farm Operators - Tidal and Wave Farm Operators -…” Source: RevenueBase Database · checked Sep 19, 2026
21	Sea-View	Indirect evidence	La Ferté Saint Aubin, FranceHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “Société Sea-View, spécialisée en prestation hydrographique et inspection sous-marine.” Source: RevenueBase Database · checked Sep 19, 2026
22	Sobatec	Indirect evidence	La Hague, FranceHQ checked Sep 19, 2026	11-50	4 contacts →
	Indirect evidence “SOBATEC est une entreprise spécialisée dans les travaux de chaudronnerie, tuyauterie, métallerie, serrurerie, soudage, charpente métallique.” Source: RevenueBase Database · checked Sep 19, 2026
23	LES Piscines Moreau	Indirect evidence	Franqueville-saint-pierre, FranceHQ checked Sep 19, 2026	11-50	3 contacts →
	Indirect evidence “L'art de l'eau” Source: RevenueBase Database · checked Sep 19, 2026
24	Naval Industrie	Indirect evidence	Poussan, FranceHQ checked Sep 19, 2026	1-10	1 contacts →
	Indirect evidence “Naval Industries est une entreprise leader dans le domaine de la soudure spécialisée, offrant des services de réparation et de reconditionnement pour les outils de travaux publics…” 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 24 of 84 underwater construction firms based in France

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Underwater construction firms based in France at a glance

As of Sep 19, 2026

28.4%Verified-email coverage

78.0Average contacts per company

11-50Median size (employees)

6.0%Largest-city concentration · La Ciotat

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for France, so it is reported there. Company counts and contact totals on this page are exact for France, over 84 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 France 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 France 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, 1,859 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 France?

RevenueBase identified 84 underwater construction firms headquartered in France 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?

Chantiers DE L'atlantique, headquartered in Saint-Nazaire, tops this list with the largest team on record.

Which city has the most underwater construction firms?

La Ciotat leads with 5 headquartered companies, followed by Lyon (2) and Montpellier (2).

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 1,859 verified decision-maker contacts tracked across these 84 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.