What Immersub does

Immersub is a Mauritius-based commercial diving company founded in 2004 by Captain Rochecouste, a former merchant ship captain and dry-dock manager, and now led by his sons Amaury and Samuel Rochecouste. The company is the oldest commercial diving firm in Mauritius and the only diving company in the Indian Ocean recognized by all six major IACS Classification Societies (NKK, DNV GL, RINA, Bureau Veritas, ABS, Lloyd's Register). Immersub provides four core service lines: ship husbandry services and repairs (eco-friendly hull cleaning via the HullWiper ROV system, class-approved in-water surveys, afloat repairs, and propeller polishing); salvages and emergency response (including Tier 2-3 oil spill response, demonstrated during the MV Wakashio incident); marine construction and dredging (jetty construction, pipeline installation, fiber optic cable laying, and dredging via partnership); and marine services and logistic support (vessel charter of workboats and emergency response craft).

The company's technology stack is anchored in IMCA-compliant diving procedures and equipment, an own-designed surface treatment plant for filtering discharge water during hull cleaning, in-house proprietary propeller straightening equipment, and a remote survey capability that allows classification society surveyors worldwide to view in-water inspections live. The firm operates a fleet of 2 work barges and 2 emergency response boats, with 6 IMCA certified divers and 20+ total collaborators, and has completed over 1,800 projects and assisted over 7,000 vessels since inception.

Immersub's business model is professional services, project-based, and quote-driven, with no publicly disclosed pricing. Revenue is generated from one-time service engagements spanning ship husbandry, salvage, emergency response, marine construction, and charter services, with customers including commercial shipping operators, maritime authorities, port operators, and classification societies across the Mascarene Islands and East Africa (Kenya, Mozambique, Tanzania, Madagascar) through its wholly-owned subsidiary Pelagic EA Ltd. The company is 100% family-owned with no external investors and pursues a direct sales motion via phone, email, WhatsApp, and referrals from classification societies and maritime authorities.

Name

Immersub

Legal name

IMMERSUB LIMITED

Website

https://immersub.com

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

11–50 employees

Short description

Immersub is a Mauritius-based, family-owned commercial diving company founded in 2004, providing ship husbandry, hull cleaning, salvage, emergency response, and marine construction services to commercial shipping operators, port authorities, and classification societies across the Indian Ocean and East Africa.

Ownership category

akta.pro rank

Product category

Commercial Diving & Subsea Services

NAICS

Support Activities for Water Transportation (4883), Other Support Activities for Water Transportation (488390)

SIC

Water Transportation (4400)

akta.pro primary industry

Underwater Hull Services (Diving, In-Water Cleaning, Propeller Polishing, Inspection) (TLAHAMAL)

akta.pro secondary industries

Salvage Diving & Underwater Recovery (Cargo/Equipment) (TLAHAIAD), Emergency Towage & Rescue (Refloating, Grounding Response) (IMAJANAB), Underwater/Port Infrastructure Security (Dive Teams, Hull & Pier Inspections) (BPAKALAH)

Keywords

• Commercial diving services
• Ship husbandry
• Hull cleaning
• Marine salvage
• Subsea construction

Headquarters

HQ city

Pointe Aux Sables

HQ country

Mauritius

HQ region

Africa

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Subsea Services - Project Based: One-time service engagements for ship husbandry, marine construction, salvage operations, and emergency response. Services are contracted per project with pricing based on scope, complexity, and equipment requirements.
2. Hull Cleaning Services: Regular hull cleaning services for vessels to reduce fuel consumption and environmental footprint. Can be combined with propeller polishing for additional fuel savings (up to 20%).
3. Charter Services: Charter of workboats, emergency response vessels and small crafts for maritime projects.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Immersub is a commercial diving services company providing subsea support to commercial vessels and maritime infrastructure in the Indian Ocean region. Its portfolio covers ship husbandry services and repairs (including eco-friendly in-water hull cleaning with the HullWiper ROV, class-approved in-water surveys, afloat structural repairs, and propeller polishing), salvage operations and emergency response including Tier 2 oil spill response, marine construction and dredging (civil underwater works, fiber optic cable laying, and dredging), and marine logistics support including charter of workboats and emergency vessels. Services are delivered by IMCA-certified divers and are recognized by all six IACS Classification Societies.

Product overview

Immersub is a commercial diving services company providing a comprehensive portfolio of subsea services for vessels and marine structures in the Indian Ocean region. The core offering centers on four main service areas: Ship Husbandry Services and Repairs (including eco-friendly hull cleaning with HullWiper ROV, class-approved in-water surveys, afloat repairs, and propeller polishing); Salvages and Emergency Response (including emergency team response and oil spill response up to Tier 2); Marine Construction and Dredging (including civil underwater works, fiber optic cable laying, and marine dredging services); and Marine Services with Logistic Support (vessel charter). The company operates from Mauritius with a subsidiary in East Africa, serving clients across the Mascarene Islands and East African coastline.

Differentiator

Problem solved

Functional benefit

Products and services

• Eco-Friendly Hull Cleaning In-water hull cleaning using the HullWiper ROV system, which uses high-pressure water jets to remove biofouling without damaging anti-fouling paint. The collected biofouling is filtered through on-board filters and a surface treatment plant, making it environmentally harmless. Targeted at commercial vessel operators seeking to reduce fuel consumption and carbon footprint.
• Class Approved In-Water Surveys Underwater surveys recognized by all six IACS classification societies, including UWILD surveys, tail shaft extension surveys, damage assessments, pre-sale surveys, close visual inspections, GVI, U/T measurements, and NDT testing. Offers remote survey capability for clients and class surveyors worldwide. Targeted at commercial vessel operators and classification societies.
• Afloat Repairs Structural repairs for vessels and mobile offshore units including welding and cutting. Services include crack repairs, doubler plate installation, propeller blade straightening, propeller crack repairs, rudder stock repair, and sea chest blanking/plugging. Targeted at commercial shipping operators needing to minimise dry-docking time.
• Propeller Polishing Propeller polishing service that can be combined with hull cleaning to reduce vessel drag, potentially saving up to 20% on fuel costs. Targeted at commercial vessel operators seeking fuel-efficiency improvements.
• Salvages and Emergency Response Emergency response team capable of responding to maritime emergencies, including assistance to major salvage operations. Includes qualified emergency responders and regional network support. Targeted at shipping operators, port authorities, and classification societies needing urgent underwater incident response.
• Oil Spill Response Tier 2-3 oil spill response solutions including installation of offshore booms and fence booms, daily reporting, and scouting in collaboration with international responders. Targeted at governments, port authorities, and maritime agencies responding to oil spill incidents.
• Marine Construction Civil underwater works including survey and construction of jetties, pontoons, sheet pile walls, piers with ultrasonic thickness measurements; renovation of quays; inspection and cleaning of hydrostations and dams. Targeted at port authorities, coastal infrastructure operators, and hydrostation operators.
• Fiber Optic Cable Laying Installation and inspection of fiber optic submarine cables including installation of articulated protectors (AP). Claimed as the most experienced diving company in the Indian Ocean for this service. Targeted at telecom operators and subsea cable owners.
• Marine Dredging Services Diver-operated dredging solutions for coastal rehabilitation projects, marinas, dams, and hydrostations, supported by high-capacity water pumps, trash pumps, and sludge pumps. Targeted at port authorities, marina operators, and hydrostation owners.
• Marine Services and Logistic Support Nautical and logistic support including charter of workboats, emergency response vessels, and small crafts for maritime projects. Targeted at shipping operators, marine contractors, and emergency responders.

Quantifiable outcome

• Propeller polishing combined with hull cleaning can save up to 20% on fuel costs
• +3 more outcomes

Named customers6 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Regional Dredging CompanyminorStrategic or Co-development PartnerImmersub has a solid partnership with a regional dredging company to provide cost-effective diver-operated dredging solutions for coastal rehabilitation projects, marinas, dams, and hydrostations.

Scale indicators7 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Hifly Ship Services: Hifly Ship Services delivers ship husbandry, underwater hull cleaning, and marine services in Brazilian ports. Comparable in focus on underwater hull maintenance and ship husbandry services similar to Immersub's core offering, though operating in the South Atlantic.
• Global Diving & Salvage: Global Diving & Salvage provides commercial diving, marine construction, and emergency response services across North America. Comparable to Immersub in offering underwater hull services, salvage, and emergency response — though operating at much larger scale in a different geography.
• Hydrex: Hydrex is a specialist underwater ship repair and maintenance company offering in-water hull cleaning, propeller polishing, and class-approved surveys globally. Closest direct peer to Immersub given its focus on commercial diving, hull husbandry, and IACS-recognized survey work.
• Caveco Subsea Services: Caveco Subsea Services offers commercial diving and ROV-based underwater services in Southern Africa. Directly comparable to Immersub in scope (hull cleaning, inspections, salvage, marine construction) and overlapping Indian Ocean/African coastal geography.
• Divetech Underwater Contractors: Divetech provides commercial diving, ROV inspection, and underwater maintenance services in the Middle East and Indian Ocean. Comparable offering to Immersub including hull cleaning, propeller polishing, and emergency response to regional shipping clients.

Broad incumbents

• Subsea 7: Subsea 7 is a global subsea engineering, construction, and services company serving the offshore energy industry. While operating at vastly larger scale and offshore-energy focused, its subsea intervention and survey capabilities overlap with Immersub's underwater service portfolio.

Peers

• Boskalis:

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/Immersub
• LinkedInlinkedin.com/company/immersub-co-ltd

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Immersub