Company lists · Data refreshed September 2026

Top 25 Underwater intervention companies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 590 companies tracked

RevenueBase identified 590 underwater intervention companies headquartered in the United States as of September 2026 and tracks 24,879 professional contacts across them, including 6,610 with verified work emails. Houston is the largest hub.

This list covers underwater intervention companies headquartered in the United States, 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

590Companies

24,879Contacts tracked

6,610Verified emails

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The 25 largest underwater intervention companies based in the United States

Ranked by team size

Top 25 of 590 underwater intervention companies based in the United States, 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	Onesubsea	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	10001+	6,543 contacts →
	Indirect evidence “SLB OneSubsea is the world’s leading subsea technology and solutions provider, focused on accelerating innovation to improve subsea asset performance, while increasing energy…” Source: RevenueBase Database · checked Sep 22, 2026
2	Helix Energy Solutions Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,706 contacts →
	Indirect evidence “Helix Energy Solutions, headquartered in Houston, Texas, is an international offshore energy services company that provides specialty services to the offshore energy industry…” Source: RevenueBase Database · checked Sep 22, 2026
3	Weeks Marine, INC	Indirect evidence	Cranford, NJ, United StatesHQ checked Sep 22, 2026	1,001-5,000	847 contacts →
	Indirect evidence “Founded in 1919, Weeks Marine, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
4	KBR Energo Engineering	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	n/a	789 contacts →
	Indirect evidence “Energo Engineering is a KBR Company that provides the full package of structural integrity management (SIM) and advanced structural engineering services for offshore floating and…” Source: RevenueBase Database · checked Sep 22, 2026
5	Tulsa Inspection Resources, LLC	Indirect evidence	Tulsa, OK, United StatesHQ checked Sep 22, 2026	1,001-5,000	770 contacts →
	Indirect evidence “Core capabilities include: Inspection Services (Chief, CWI, NACE/AMPP, Utility, Environmental, Safety, Poly, etc), Non-Destructive Examination (Ultrasonic Testing (UT), Phased…” Source: RevenueBase Database · checked Sep 22, 2026
6	WIS Wellbore Integrity Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	744 contacts →
	Indirect evidence “Wellbore Integrity Solutions provides superior technologies and global service domain expertise, enabling our customers to enhance the full lifecycle of their wells by solving…” Source: RevenueBase Database · checked Sep 22, 2026
7	C & C Technologies, INC	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 22, 2026	501-1,000	672 contacts →
	Indirect evidence “Oceaneering International, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
8	GR Energy Services	Indirect evidence	Sugar Land, TX, United StatesHQ checked Sep 22, 2026	501-1,000	438 contacts →
	Indirect evidence “GR Energy Services is a completion solutions company committed to lowering oil and gas company operational risk and total cost of operations.” Source: RevenueBase Database · checked Sep 22, 2026
9	Imia, LLC	Indirect evidence	Chesapeake, VA, United StatesHQ checked Sep 22, 2026	1,001-5,000	293 contacts →
	Indirect evidence “Founded in 1985 and a distinguished part of ARMADA Parent Inc, established itself as a premier marine preservation company, delivering an extensive suite of services to…” Source: RevenueBase Database · checked Sep 22, 2026
10	Resolve Marine	Indirect evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 22, 2026	51-200	277 contacts →
	Indirect evidence “Resolve Marine, a global leader in vessel salvage, emergency response, compliance and specialized marine services, has served and supported clients and projects for 40 years.” Source: RevenueBase Database · checked Sep 22, 2026
11	Trendsetter Engineering, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	201-500	259 contacts →
	Indirect evidence “Trendsetter is a global provider of specialized subsea solutions to the oil and gas industry's toughest challenges.” Source: RevenueBase Database · checked Sep 22, 2026
12	J.F. Brennan Company	Indirect evidence	La Crosse, WI, United StatesHQ checked Sep 22, 2026	501-1,000	241 contacts →
	Indirect evidence “At Brennan, our people are our top priority.” Source: RevenueBase Database · checked Sep 22, 2026
13	Ballard Marine Construction	Partial evidence	Washougal, WA, United StatesHQ checked Sep 22, 2026	51-200	236 contacts →
	Partial evidence “Ballard Marine Construction (Ballard) is a specialty marine and underwater contractor.” Source: RevenueBase Database · checked Sep 22, 2026
14	Global Diving & Salvage, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 22, 2026	201-500	217 contacts →
	Indirect evidence “Global is a leader in the marine services industry with decades of experience managing complex, critical and technical projects in and around the water.” Source: RevenueBase Database · checked Sep 22, 2026
15	Gladiator Energy	Partial evidence	The Woodlands, TX, United StatesHQ checked Sep 22, 2026	51-200	200 contacts →
	Partial evidence “Well intervention operations range from basic applications in the well to complex downhole challenges – and each require a custom designed solution.” Source: RevenueBase Database · checked Sep 22, 2026
16	Underwater Construction Corporation	Partial evidence	Essex, CT, United StatesHQ checked Sep 22, 2026	201-500	190 contacts →
	Partial evidence “Since 1969, Underwater Construction Corporation (UCC) has been a leading provider of underwater services to commercial and government facilities.” Source: RevenueBase Database · checked Sep 22, 2026
17	Subsea Global Solutions	Indirect evidence	Miami, FL, United StatesHQ checked Sep 22, 2026	201-500	176 contacts →
	Indirect evidence “Welcome to Subsea Global Solutions where EVERY DAY our goal is to deliver unrivaled service.” Source: RevenueBase Database · checked Sep 22, 2026
18	Aqueos Corporation	Indirect evidence	Broussard, LA, United StatesHQ checked Sep 22, 2026	201-500	175 contacts →
	Indirect evidence “Aqueos is a 'World Class Subsea Service Provider℠' with our core values being a commitment to “excellence” and our dedication to an “accident-free” workplace.” Source: RevenueBase Database · checked Sep 22, 2026
19	Phoenix International Holdings, INC	Indirect evidence	Largo, United StatesHQ checked Sep 22, 2026	201-500	170 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
20	Deepsea Technologies	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	51-200	166 contacts →
	Indirect evidence “Deepsea Technologies, Inc.(DTI) Engineers and Manufactures a wide range of products and equipment used in subsea oil & gas field development projects.” Source: RevenueBase Database · checked Sep 22, 2026
21	PRT Offshore An Expro Company	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	51-200	155 contacts →
	Indirect evidence “PRT Offshore, an Expro company, provides high-quality oilfield rental equipment and services for the global offshore industry.” Source: RevenueBase Database · checked Sep 22, 2026
22	Petrolog Group	Indirect evidence	Houston, United StatesHQ checked Sep 22, 2026	501-1,000	131 contacts →
	Indirect evidence “Petrolog brings energy to the world as an integrated provider of solutions for the entire oil and gas lifecycle.” Source: RevenueBase Database · checked Sep 22, 2026
23	On & Offshore Quality Control Specialist, Llc. QCS	Indirect evidence	Austin, TX, United StatesHQ checked Sep 22, 2026	501-1,000	130 contacts →
	Indirect evidence “Welcome to On & Offshore Quality Control Specialists, LLC.” Source: RevenueBase Database · checked Sep 22, 2026
24	Quality Energy Services	Indirect evidence	Houma, TX, United StatesHQ checked Sep 22, 2026	201-500	120 contacts →
	Indirect evidence “Since 2001, Quality Energy Services has been an industry leader in providing total-solution services to energy majors in the gulf of Mexico and to future ventures in the world…” Source: RevenueBase Database · checked Sep 22, 2026
25	Bisso Marine	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	201-500	118 contacts →
	Indirect evidence “BISSO MARINE is a subsea & offshore midstream infrastructure contractor that has been providing unsurpassed service and quality to the marine and energy industries since 1890.” 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 590 underwater intervention companies based in the United States

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Underwater intervention companies based in the United States at a glance

As of Sep 22, 2026

26.6%Verified-email coverage

42.2Average contacts per company

11-50Median size (employees)

12.0%Largest-city concentration · Houston

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

242

11-50

207

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 590 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 the United States 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 United States 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, 6,610 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.

Underwater intervention companies by metro

Underwater intervention companies in Houston71

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 the United States?

RevenueBase identified 590 underwater intervention companies headquartered in the United States 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?

Onesubsea, headquartered in Houston, tops this list with the largest team on record.

Which city has the most underwater intervention companies?

Houston leads with 71 headquartered companies, followed by Seattle (13) and Houma (12).

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 6,610 verified decision-maker contacts tracked across these 590 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.