Company lists · Data refreshed September 2026

Top 25 Underwater intervention companies based in France

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 104 companies tracked

RevenueBase identified 104 underwater intervention companies headquartered in France as of September 2026 and tracks 1,779 professional contacts across them, including 291 with verified work emails. La Ciotat is the largest hub.

This list covers underwater intervention companies 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 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

104Companies

1,779Contacts tracked

291Verified emails

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The 25 largest underwater intervention companies based in France

Ranked by team size

Top 25 of 104 underwater intervention companies based in France, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to underwater intervention 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	Geocean	Indirect evidence	Cassis, FranceHQ checked Sep 22, 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 22, 2026
2	Hydrokarst	Indirect evidence	Sassenage, FranceHQ checked Sep 22, 2026	201-500	170 contacts →
	Indirect evidence “HYDROKARST joins JARNIAS GROUP!” Source: RevenueBase Database · checked Sep 22, 2026
3	Alseamar	Partial evidence	Rousset, FranceHQ checked Sep 22, 2026	201-500	139 contacts →
	Partial evidence “Founded in 2015, ALSEAMAR, a subsidiary of the ALCEN Group, develops, designs, operates and maintains high-performance underwater solutions that meet the requirements of…” Source: RevenueBase Database · checked Sep 22, 2026
4	Nouvetra-Serfim OA	Indirect evidence	Janneyrias, FranceHQ checked Sep 22, 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 22, 2026
5	Hydroconsult Sarl	Indirect evidence	Kervignac, FranceHQ checked Sep 22, 2026	11-50	49 contacts →
	Indirect evidence “Hydroconsult is a recognized actor in worldwide Hydrographic and Geophysical Survey's assistance and Marine Consulting, with 20 years experience.” Source: RevenueBase Database · checked Sep 22, 2026
6	Satif OA	Indirect evidence	La Talaudière, FranceHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect evidence “Satif OA accompagne ses clients dans le cadre de leurs besoins en expertises en milieu hostile (subaquatique, confiné, pollué.) Les moyens humains et techniques permettent…” Source: RevenueBase Database · checked Sep 22, 2026
7	Watertracks	Indirect evidence	Perols, FranceHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect evidence “Ingénierie et services subaquatiques robotisés.” Source: RevenueBase Database · checked Sep 22, 2026
8	TETIS	Indirect evidence	Bellevigny, FranceHQ checked Sep 22, 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 22, 2026
9	Forssea Robotics	Strong evidence	Paris, FranceHQ checked Sep 22, 2026	11-50	25 contacts →
	Strong evidence “Forssea Robotics is a smart ROV asset and services provider established in 2016 to increase productivity of underwater inspection and light intervention repeatable tasks.” Source: RevenueBase Database · checked Sep 22, 2026
10	Sub-C Marine	Indirect evidence	Feyzin, FranceHQ checked Sep 22, 2026	11-50	20 contacts →
	Indirect evidence “SUB-C MARINE est une société spécialisée dans l'inspection subaquatique par robot.” Source: RevenueBase Database · checked Sep 22, 2026
11	Delair Marine	Partial evidence	Marseille, FranceHQ checked Sep 22, 2026	11-50	19 contacts →
	Partial evidence “Delair Marine is the company behind Seasam, the world's first compact autonomous underwater drone made for professional applications.” Source: RevenueBase Database · checked Sep 22, 2026
12	CERES	Indirect evidence	Montfarville, FranceHQ checked Sep 22, 2026	1-10	19 contacts →
	Indirect evidence “Spécialisés dans l'acquisition et le traitement de données géophysiques marines, la plongée, la recherche et le renflouement d'épaves, la société CERES répond aux besoins de ses…” Source: RevenueBase Database · checked Sep 22, 2026
13	ARESO	Indirect evidence	Avelin, FranceHQ checked Sep 22, 2026	11-50	18 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
14	Marine Tech	Indirect evidence	Six Fours Les Plages, FranceHQ checked Sep 22, 2026	1-10	17 contacts →
	Indirect evidence “Plus de 20 années d'expérience dans les opérations maritimes - Créée par les fondateurs de Nymphea Environnement, la société MARINE TECH propose les activités suivantes-…” Source: RevenueBase Database · checked Sep 22, 2026
15	Roboplanet	Indirect evidence	Nantes, FranceHQ checked Sep 22, 2026	1-10	16 contacts →
	Indirect evidence “Expertise Maritime, Vente d'appareils innovants et réalisation de prestations de Contrôle non-destructif par Ultrasons,(Mesures et cartographie de corrosion des navires, citernes…” Source: RevenueBase Database · checked Sep 22, 2026
16	Neotek	Indirect evidence	Caudan, FranceHQ checked Sep 22, 2026	11-50	16 contacts →
	Indirect evidence “Neotek est une société française détenue à 100% par Sea Vorian.” Source: RevenueBase Database · checked Sep 22, 2026
17	DV Offshore	Indirect evidence	Saint-cloud, FranceHQ checked Sep 22, 2026	1-10	13 contacts →
	Indirect evidence “DV Offshore’s expertise includes floating systems, terminals, mooring systems, floating wind turbines, subsea production, pipelines & risers, allowing us to provide technical and…” Source: RevenueBase Database · checked Sep 22, 2026
18	Setec Invivo	Indirect evidence	La Forêt-fouesnant, FranceHQ checked Sep 22, 2026	51-200	13 contacts →
	Indirect evidence “setec invivo intervient dès l’acquisition des données en mer, ce qui confère autonomie et efficacité.” Source: RevenueBase Database · checked Sep 22, 2026
19	TES Technifor	Indirect evidence	Gondreville, FranceHQ checked Sep 22, 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 22, 2026
20	Kappa Offshore Solutions	Indirect evidence	St-Nazaire, FranceHQ checked Sep 22, 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 22, 2026
21	Novawell	Indirect evidence	Montpellier, FranceHQ checked Sep 22, 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 22, 2026
22	Jifmar Group	Indirect evidence	Aix En Provence, FranceHQ checked Sep 22, 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 22, 2026
23	SEA Vorian	Indirect evidence	Caudan, FranceHQ checked Sep 22, 2026	51-200	7 contacts →
	Indirect evidence “Le groupe SEA VORIAN est dédié à la conception, la réalisation, l’intégration et à la mise en œuvre d’équipements de hautes technologies dans les environnements marins.” Source: RevenueBase Database · checked Sep 22, 2026
24	L'octant	Indirect evidence	Saulce Sur Rhone, FranceHQ checked Sep 22, 2026	11-50	6 contacts →
	Indirect evidence “L'octant est spécialisé dans les opérations de maintenances et de contrôles non destructifs au service de l’industrie, particulièrement dans les secteurs naval et pétrolier.” Source: RevenueBase Database · checked Sep 22, 2026
25	Sea-View	Indirect evidence	La Ferté Saint Aubin, FranceHQ checked Sep 22, 2026	1-10	5 contacts →
	Indirect evidence “Société Sea-View, spécialisée en prestation hydrographique et inspection sous-marine.” 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 intervention 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 intervention companies.
Partial evidence: Its own public description names part of underwater intervention companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name underwater intervention 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 104 underwater intervention companies based in France

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Underwater intervention companies based in France at a glance

As of Sep 22, 2026

16.4%Verified-email coverage

17.1Average contacts per company

1-10Median size (employees)

3.8%Largest-city concentration · La Ciotat

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 104 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 intervention 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 France whose own description of what they do matches “underwater intervention 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 intervention 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 intervention companies, 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, 291 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.

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 intervention 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 intervention companies are there based in France?

RevenueBase identified 104 underwater intervention companies 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?

Geocean, headquartered in Cassis, tops this list with the largest team on record.

Which city has the most underwater intervention companies?

La Ciotat leads with 4 headquartered companies, followed by Lyon (3) and Marseille (3).

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 291 verified decision-maker contacts tracked across these 104 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.