Company lists · Data refreshed September 2026

Top 25 Underwater intervention companies based in Norway

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 152 companies tracked

RevenueBase identified 152 underwater intervention companies headquartered in Norway as of September 2026 and tracks 7,424 professional contacts across them, including 2,803 with verified work emails. Stavanger is the largest hub.

This list covers underwater intervention companies headquartered in Norway, 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

152Companies

7,424Contacts tracked

2,803Verified emails

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

The 25 largest underwater intervention companies based in Norway

Ranked by team size

Top 25 of 152 underwater intervention companies based in Norway, 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	DOF	Indirect evidence	Bergen, NorwayHQ checked Sep 22, 2026	5,001-10,000	2,942 contacts →
	Indirect evidence “With a multi-national workforce of over 5,700 personnel, DOF is an international group of companies which owns and operates a fleet of modern offshore/subsea vessels, with an…” Source: RevenueBase Database · checked Sep 22, 2026
2	Island Offshore	Indirect evidence	Ulsteinvik, NorwayHQ checked Sep 22, 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 22, 2026
3	Global Maritime	Indirect evidence	Stavanger, NorwayHQ checked Sep 22, 2026	201-500	472 contacts →
	Indirect evidence “Global Maritime delivers integrated marine solutions for a changing offshore world.” Source: RevenueBase Database · checked Sep 22, 2026
4	Reach Subsea	Indirect evidence	Haugesund, NorwayHQ checked Sep 22, 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 22, 2026
5	Ocean Installer	Indirect evidence	Stavanger, NorwayHQ checked Sep 22, 2026	201-500	299 contacts →
	Indirect evidence “Ocean Installer is a leading marine construction company that specializes in offshore installation services with more than 15 years of experience delivering large and complex…” Source: RevenueBase Database · checked Sep 22, 2026
6	Akofs Offshore	Partial evidence	Oslo, NorwayHQ checked Sep 22, 2026	201-500	233 contacts →
	Partial evidence “AKOFS Offshore is a global provider of vessel based subsea well construction and intervention services to the oil and gas industry.” Source: RevenueBase Database · checked Sep 22, 2026
7	Imenco	Indirect evidence	Aksdal, NorwayHQ checked Sep 22, 2026	201-500	199 contacts →
	Indirect evidence “Imenco is a group of companies working mainly in five main business areas: Offshore oil & gas, offshore renewables, aquaculture, marine & naval and industrial.” Source: RevenueBase Database · checked Sep 22, 2026
8	Havila Subsea & Renewables	Indirect evidence	Aalesund, NorwayHQ checked Sep 22, 2026	201-500	120 contacts →
	Indirect evidence “Havila Subsea & Renewables operates an advanced fleet of vessels dedicated to Diving, Offshore Inspection, Repair, and Maintenance (IRM), as well as Construction.” Source: RevenueBase Database · checked Sep 22, 2026
9	Island Drilling Company AS	Partial evidence	Sandsli, NorwayHQ checked Sep 22, 2026	51-200	114 contacts →
	Partial evidence “Island Drilling was established in 2006 by industry veterans and Island Offshore, the leading global player in well intervention, to build and own special purpose semi-submersible…” Source: RevenueBase Database · checked Sep 22, 2026
10	Norbit Subsea	Partial evidence	Trondheim, NorwayHQ checked Sep 22, 2026	51-200	105 contacts →
	Partial evidence “Norbit Subsea is a supplier of underwater instrumentation and communication solutions.” Source: RevenueBase Database · checked Sep 22, 2026
11	Optime, A Halliburton Service	Indirect evidence	Notodden, NorwayHQ checked Sep 22, 2026	51-200	98 contacts →
	Indirect evidence “Optime, A Halliburton Service is an innovative subsea oil and gas provider focusing on cost efficient solutions specifically towards products within the well access, well…” Source: RevenueBase Database · checked Sep 22, 2026
12	Abyss AS	Indirect evidence	Kristiansund, NorwayHQ checked Sep 22, 2026	201-500	84 contacts →
	Indirect evidence “Abyss utfører alle tjenester på sjøen - over og under vann.” Source: RevenueBase Database · checked Sep 22, 2026
13	Subseadesign AS	Indirect evidence	Lierbyen, NorwayHQ checked Sep 22, 2026	51-200	47 contacts →
	Indirect evidence “SubseaDesign (SD) is an engineering, design and fabrication company providing equipment and services for the oil and gas industry.” Source: RevenueBase Database · checked Sep 22, 2026
14	Wellconnection Group	Indirect evidence	Stavanger, NorwayHQ checked Sep 22, 2026	51-200	46 contacts →
	Indirect evidence “WellConnection Group is the leading company within inspection, maintenance and repair services (IMR) for drilling and subsea equipment on the Norwegian Continental Shelf.” Source: RevenueBase Database · checked Sep 22, 2026
15	RTS	Indirect evidence	Åkrehamn, NorwayHQ checked Sep 22, 2026	11-50	44 contacts →
	Indirect evidence “RTS is a supplier of engineering solutions, equipment rental, product sales and personnel supply.” Source: RevenueBase Database · checked Sep 22, 2026
16	Subseapartner AS	Indirect evidence	Haugesund, NorwayHQ checked Sep 22, 2026	11-50	44 contacts →
	Indirect evidence “SubseaPartner is a leading diving contractor in the shallow-deep segment.” Source: RevenueBase Database · checked Sep 22, 2026
17	Mohn Drilling AS	Indirect evidence	Bønes, NorwayHQ checked Sep 22, 2026	11-50	44 contacts →
	Indirect evidence “Mohn Drilling AS is a diving and ROV contractor based in Bergen, Norway, and the main area of activity is offshore Tierra del Fuego, Argentina.” Source: RevenueBase Database · checked Sep 22, 2026
18	Swire Seabed	Indirect evidence	Bergen, NorwayHQ checked Sep 22, 2026	51-200	40 contacts →
	Indirect evidence “Swire Seabed provides a highly flexible range of integrated subsea services to the global Oil & Gas and renewables industries.” Source: RevenueBase Database · checked Sep 22, 2026
19	Innova	Partial evidence	Sandnes, NorwayHQ checked Sep 22, 2026	51-200	38 contacts →
	Partial evidence “Established in 1997, Innova is a leading supplier of services, equipment and solutions to the international underwater industry.” Source: RevenueBase Database · checked Sep 22, 2026
20	Kystdesign	Indirect evidence	Aksdal, NorwayHQ checked Sep 22, 2026	51-200	37 contacts →
	Indirect evidence “KYSTDESIGN delivers a wide range of products for the subsea oil- and gas industry, renewables, research and fish farming.” Source: RevenueBase Database · checked Sep 22, 2026
21	TIOS	Indirect evidence	Stavanger, NorwayHQ checked Sep 22, 2026	n/a	34 contacts →
	Indirect evidence “As of July 29th 2021 TIOS is fully owned by TechnipFMC.” Source: RevenueBase Database · checked Sep 22, 2026
22	Dwellop Group	Partial evidence	Stavanger, NorwayHQ checked Sep 22, 2026	51-200	31 contacts →
	Partial evidence “Dwellop Group is an independent Norwegian company delivering topside handling equipment for Well Intervention, WorkOver and P&A operations.” Source: RevenueBase Database · checked Sep 22, 2026
23	Remotion AS	Indirect evidence	Sandnes, NorwayHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect evidence “Remotion delivers unique hull repair, maintenance and inspection services based on our technology of magnetic robots (M-ROV).” Source: RevenueBase Database · checked Sep 22, 2026
24	RAKON	Indirect evidence	Stavanger, NorwayHQ checked Sep 22, 2026	11-50	27 contacts →
	Indirect evidence “Rakon offers contractor and consulting services with a high focus on fit for purpose, safe- and cost-effective solutions.” Source: RevenueBase Database · checked Sep 22, 2026
25	Techno Dive	Indirect evidence	Avaldsnes, NorwayHQ checked Sep 22, 2026	11-50	25 contacts →
	Indirect evidence “Techno Dive is your partner for Safe and Efficient Subsea Work.” 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 152 underwater intervention companies based in Norway

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,803 reachable decision-makers.

Free signup · no credit card

View the full list →

Underwater intervention companies based in Norway at a glance

As of Sep 22, 2026

37.8%Verified-email coverage

48.8Average contacts per company

11-50Median size (employees)

8.6%Largest-city concentration · Stavanger

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for Norway, so it is reported there. Company counts and contact totals on this page are exact for Norway, over 152 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 Norway 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 Norway 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, 2,803 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 Norway?

RevenueBase identified 152 underwater intervention companies headquartered in Norway 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?

DOF, headquartered in Bergen, tops this list with the largest team on record.

Which city has the most underwater intervention companies?

Stavanger leads with 13 headquartered companies, followed by Oslo (12) and Haugesund (9).

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 2,803 verified decision-maker contacts tracked across these 152 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.

Ready to reach these companies? Verified emails and direct dials for all 152 underwater intervention companies based in Norway. Start with a free account, no credit card.

Download this list →

Related lists

Underwater intervention companies by geography

Browse the directory

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.