Company lists · Data refreshed September 2026

Top 25 Deep sea exploration companies worldwide

Name: Deep sea exploration companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 1,633 companies tracked

RevenueBase identified 1,633 deep sea exploration companies worldwide as of September 2026 and tracks 72,649 professional contacts across them, including 16,778 with verified work emails. The United States is the largest market and Singapore the largest hub.

This list covers deep sea exploration companies 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 deep sea exploration companies 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

1,633Companies

72,649Contacts tracked

16,778Verified emails

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The 25 largest deep sea exploration companies worldwide

Ranked by team size

Top 25 of 1,633 deep sea exploration companies worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to deep sea exploration 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	Seadrill	Indirect evidence	Houston, United StatesHQ checked Sep 19, 2026	1,001-5,000	4,845 contacts →
	Indirect evidence “Seadrill is setting the standard in deepwater oil and gas drilling.” Source: RevenueBase Database · checked Sep 19, 2026
2	Deme Group	Indirect evidence	Beveren-kruibeke-zwijndrecht, BelgiumHQ checked Sep 19, 2026	5,001-10,000	4,395 contacts →
	Indirect evidence “DEME (Euronext Brussels: DEME) is a leading contractor in the fields of offshore energy, dredging and marine infrastructure, and environmental remediation.” Source: RevenueBase Database · checked Sep 19, 2026
3	Tidewater	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	5,001-10,000	3,290 contacts →
	Indirect evidence “Tidewater Inc.(Tidewater) is the owner and operator of the world’s largest Offshore Support Vessel (OSV) fleet.” Source: RevenueBase Database · checked Sep 19, 2026
4	DOF	Indirect evidence	Bergen, NorwayHQ checked Sep 19, 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 19, 2026
5	Allseas	Indirect evidence	Châtel-saint-denis, SwitzerlandHQ checked Sep 19, 2026	1,001-5,000	2,554 contacts →
	Indirect evidence “Allseas is a world-leading contractor in the offshore energy market.” Source: RevenueBase Database · checked Sep 19, 2026
6	Free Lancer	Indirect evidence	BrazilHQ checked Sep 19, 2026	n/a	2,224 contacts →
	Indirect evidence “Rov company.” Source: RevenueBase Database · checked Sep 19, 2026
7	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
8	CCC Underwater Engineering S.A.L	Indirect evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 19, 2026	201-500	1,279 contacts →
	Indirect evidence “(Underwater Engineering) S.A.L was established in 1976.” Source: RevenueBase Database · checked Sep 19, 2026
9	Shearwater Geoservices	Indirect evidence	Laksevåg, NorwayHQ checked Sep 19, 2026	1,001-5,000	1,031 contacts →
	Indirect evidence “Shearwater is a global marine geoscience and technology business.” Source: RevenueBase Database · checked Sep 19, 2026
10	Wintermar Offshore Marine TBK	Indirect evidence	Kebayoran Lama, IndonesiaHQ checked Sep 19, 2026	501-1,000	972 contacts →
	Indirect evidence “As a one-stop offshore marine services company, Wintermar Offshore Marine Group strives to support all types of offshore operations, offering innovative vessel and logistical…” Source: RevenueBase Database · checked Sep 19, 2026
11	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
12	Swire Pacific Offshore	Indirect evidence	SingaporeHQ checked Sep 19, 2026	1,001-5,000	805 contacts →
	Indirect evidence “Established since 1975, Swire Pacific Offshore (SPO) was a trusted marine services provider that pride itself on delivering safe, high quality, reliable and sustainable Marine…” Source: RevenueBase Database · checked Sep 19, 2026
13	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
14	Ocean Infinity	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	714 contacts →
	Indirect evidence “Ocean Infinity is a technology-driven company transforming how ocean operations are carried out.” Source: RevenueBase Database · checked Sep 19, 2026
15	Greatship	Indirect evidence	Mumbai, IndiaHQ checked Sep 19, 2026	1,001-5,000	681 contacts →
	Indirect evidence “The GREATSHIP GROUP is a provider of quality offshore oilfield services, owning and operating a comprehensive range of new generation, technologically advanced vessels and modern…” Source: RevenueBase Database · checked Sep 19, 2026
16	Pacific Radiance LTD	Indirect evidence	SingaporeHQ checked Sep 19, 2026	201-500	674 contacts →
	Indirect evidence “The Pacific Radiance Group of Companies is an established owner and operator of offshore vessels and a provider of subsea services, shipyard services, marine equipment as well as…” Source: RevenueBase Database · checked Sep 19, 2026
17	C & C Technologies, INC	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 19, 2026	501-1,000	672 contacts →
	Indirect evidence “Oceaneering International, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
18	Kongsberg Discovery	Partial evidence	Horten, NorwayHQ checked Sep 19, 2026	1,001-5,000	638 contacts →
	Partial evidence “In a constantly changing market environment, Kongsberg Discovery is serving the ocean space from the deepest sea to the outer space.” Source: RevenueBase Database · checked Sep 19, 2026
19	Gardline Limited	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 19, 2026	501-1,000	545 contacts →
	Indirect evidence “Gardline is a best-in-class provider of geophysical, geotechnical and environmental marine surveys.” Source: RevenueBase Database · checked Sep 19, 2026
20	Pacific Drilling	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	501-1,000	538 contacts →
	Indirect evidence “On April 15, 2021, Noble Corporation plc completed its acquisition of Pacific Drilling Company LLC.” Source: RevenueBase Database · checked Sep 19, 2026
21	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
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	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
24	Mote Marine Laboratory & Aquarium	Indirect evidence	Sarasota, FL, United StatesHQ checked Sep 19, 2026	201-500	453 contacts →
	Indirect evidence “Founded in 1955, Mote Marine Laboratory & Aquarium is an independent, nonprofit 501(c)3 research organization based in Sarasota, Fla, with additional field stations in eastern…” Source: RevenueBase Database · checked Sep 19, 2026
25	Geomar Helmholtz-Zentrum FÜR Ozeanforschung Kiel	Indirect evidence	Kiel, GermanyHQ checked Sep 19, 2026	1,001-5,000	421 contacts →
	Indirect evidence “GEOMAR Helmholtz Centre for Ocean Research Kiel is one of the world's leading institutions in ocean research.” 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: deep sea exploration 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 deep sea exploration companies.
Partial evidence: Its own public description names part of deep sea exploration companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name deep sea exploration 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 1,633 deep sea exploration companies worldwide

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Deep sea exploration companies worldwide at a glance

As of Sep 19, 2026

23.1%Verified-email coverage

44.5Average contacts per company

11-50Median size (employees)

1.9%Largest-city concentration · Singapore

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

706

11-50

570

51-200

226

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 deep sea exploration 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.
Coverage: Every country. Country and city lists for deep sea exploration companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “deep sea exploration 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 deep sea exploration 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 deep sea exploration companies, 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, 16,778 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.

Deep sea exploration companies by location

14 lists · largest first

Every Deep sea exploration companies 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 deep sea exploration 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 deep sea exploration companies are there worldwide?

RevenueBase identified 1,633 deep sea exploration companies 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?

Seadrill, headquartered in Liverpool, tops this list with the largest team on record.

Which country has the most deep sea exploration companies?

The United States leads with 290 companies, followed by the United Kingdom (116) and Norway (73). Every deep sea exploration companies list by country and city is linked on this page.

Which city has the most deep sea exploration companies?

Singapore leads with 31 headquartered companies, followed by Houston (19) and Dubai (14).

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 16,778 verified decision-maker contacts tracked across these 1,633 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.