Seløy Undervannsservice

What Seløy Undervannsservice does

Seløy Undervannsservice AS is a Norwegian underwater services and maritime contracting company founded in 1984 and headquartered in Herøy, Nordland, Norway. The company delivers a comprehensive portfolio of underwater services for customers along Norway's rugged coastline, including sea pipeline laying (100mm to 1500mm diameter), submarine cable installation, salvage and lifting operations, professional diving, mooring and anchoring, vessel inspection, and seabed surveying. It serves four primary customer segments: the aquaculture industry (salmon and fish farming operators), insurance companies and private/commercial vessel owners requiring salvage work, and Norwegian municipalities executing water and power infrastructure projects. Notable executed work includes a ~15.5 km submarine cable installation between Fauske and Breivik.

The company's technical platform is built around an owned fleet of four specialized vessels — M/S Nautilus Survey (1997, 24.2m aluminum survey vessel), M/S Nautilus Aldra (1974, 45.2m multi-purpose vessel with 150-ton and 90-ton cranes), Nautilus Multi barge (2000, 31m x 12m with 90-ton/m crane), and a configurable Pontoon Barge — supported by ROV systems (Sub-fighter 15K, Sub-fighter 30K, Sperre 30K) and a Hydra Model 1500 decompression chamber. Sister company Scansub AS extends the capability set with multibeam sonar survey (Kongsberg EM2040, Teledyne SeaBat T50-P), sidescan, sub-bottom profiling, and mooring positioning services. Seløy holds Sentraltgodkjent (Central Approval) certification and operates under an internal HSE/quality control system aimed at leading Norway's inshore sea cable and pipeline segment.

The business model is project-based professional services delivery, acting as a total contractor from planning through execution. Pricing is quoted per project and is not publicly disclosed. The go-to-market motion is direct sales via phone and email, including a 24-hour service line for salvage work. With 21 full-time employees comprising divers, project managers, skippers, and crew, the company operates regionally within Nordland while claiming Norway-wide service coverage. Revenue is not publicly disclosed and the company is privately held with no institutional or venture capital ownership documented in available sources.

Name

Seløy Undervannsservice

Legal name

Seløy Undervannsservice AS

Website

https://seloy.no

Company type

Private

Founded year

1984

Operating status

Operating

Headcount range

11–50 employees

Short description

Seløy Undervannsservice AS is a Norwegian underwater services and maritime contracting company founded in 1984, based in Herøy, Nordland. It delivers sea pipeline, submarine cable, salvage, diving, and survey services to aquaculture operators, municipalities, insurance firms, and vessel owners across Norway.

Ownership category

akta.pro rank

Product category

Maritime Underwater Services

NAICS

Ship Building and Repairing (336611), Other Support Activities for Water Transportation (48839)

SIC

Ship & Boat Building & Repairing (3730), Construction - Special Trade Contractors (1700)

akta.pro primary industry

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

akta.pro secondary industries

Subsea Cable Construction, Marine Installation & Repair Services (HDAIALAC), Underwater Hull Inspection, Cleaning & Propeller Services (TLAKAKAJ)

Keywords

• Underwater marine services
• Submarine cable installation
• Sea pipeline laying
• ROV inspection surveys
• Aquaculture diving services

Headquarters

HQ city

Herøya

HQ country

Norway

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Technology or R&D, Supply Chain

Revenue model

1. Maritime Underwater Services: Project-based professional services for maritime operations including sea pipeline laying, sea cable installation, salvage and lifting, diving services, and survey operations. Revenue generated through contracts for specific underwater projects.
2. Salvage and Raising Services: Berging and heving services for boats and equipment for insurance companies, private individuals, and businesses, including use of ROV/divers and lifting equipment.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Seløy Undervannsservice AS is a Norwegian maritime contractor that delivers underwater and marine services for aquaculture operators, municipalities, insurance companies, and private/commercial vessel owners. The company acts as a total contractor from planning through execution, providing sea pipeline laying (100–1500 mm diameter), submarine cable installation, ROV survey and inspection, vessel salvage and lifting, commercial diving, anchoring/mooring, and seabed mapping. Services are delivered with owned multi-functional vessels and ROV/diving equipment operating primarily in the rugged coastal waters of northern Norway.

Product overview

Seløy Undervannsservice is a maritime services company offering a comprehensive portfolio of underwater services. The core offering consists of eight main service areas: Rescue/Lifting, Diving, Anchoring, Lift/Transport, Maritime Contracting, Aquaculture, Sea Pipeline, and Survey. These services are delivered using a fleet of four specialized vessels (M/S Nautilus Survey, M/S Nautilus Aldra, Nautilus Multi Barge, and Pontoon Barge) and ROV equipment (Sub-fighter 15K, Sub-fighter 30K, and Sperre 30K). The company also operates through its sister company Scansub, which provides specialized seabed mapping and survey services using advanced multibeam sonar systems (Kongsberg EM2040, Teledyne SeaBat T50-P). Additional equipment includes a Hydra Model 1500 decompression chamber for diver safety. The company functions as a total contractor from planning through execution.

Differentiator

Problem solved

Functional benefit

Products and services

• Berging/heving (Rescue and Lifting) Recovery and lifting of boats and underwater equipment using ROVs, divers, and lifting gear; includes dewatering, coarse sealing, and underwater lifting operations for insurance companies, private clients, and businesses.
• Dykking (Commercial Diving) Professional commercial diving services including vessel inspection (propeller, rudder, sea water intake), power station inspection, shaft inspection, underwater drilling, and search and recovery operations.
• Forankring (Anchoring/Mooring) Mooring and positioning services for sea pipelines and aquaculture facilities, including mooring inspection for fish farming sites through collaboration with sister company Scansub.
• Løft/Tjenester (Lift and Transport) Professional lifting and transport services using multi-functional vessels with crane capacity ranging from 14 to 47 tons/m, including cable transport and specialized barge operations.
• Maritim Entreprenør (Maritime Contractor) Full-service maritime contractor delivering turnkey projects from planning to execution, including underwater drilling and sea pipeline installation.
• Oppdrett (Aquaculture Services) Comprehensive underwater services for the aquaculture industry including sea pipeline installation (water supply, drainage, intake), pipeline and cable securing, vessel lifting, search and rescue, and vessel inspection.
• Sjøledning (Sea Pipeline Installation) Sea pipeline services including planning, calculation, sinking, ROV survey, pipe and sieve cleaning, concrete weight installation, cathodic protection, shore zone securing, and sign installation for pressure, intake, and outlet pipelines ranging from 100 mm to 1500 mm in diameter.
• Survey (Marine Surveying) Sea floor mapping, pre-route survey, as-laid survey, as-built survey, cable laying monitoring, and Touch Down Point positioning using advanced ROV technology and navigation systems.

Quantifiable outcome

• Completed submarine cable installation of approximately 15.5 km between Fauske and Breivik

Named customers5 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• Scansub AScoreStrategic or Co-development PartnerScansub is a sister company of Seløy Undervannsservice AS, specializing in seabed mapping and survey services. Scansub performs multibeam surveys, sidescan, sub-bottom profiling, and positioning of moorings. For larger projects requiring both underwater construction and seabed surveying, the companies can offer efficient collaboration for smoother project execution.

Scale indicators5 records

Recent moves4 records

Expansion highlights4 records

Others

• Solstad Offshore: Solstad is a major Norwegian OSV owner-operator (PSVs, AHTS, construction vessels) serving global offshore markets. While not a direct competitor to Seløy's underwater services, Solstad's vessels sometimes crew-change or support similar subsea campaigns, making it a regional maritime counterpart.
• Imenco: Imenco is a Norwegian supplier of underwater cameras, ROV systems, and subsea equipment to aquaculture, offshore, and defense customers; it is an equipment-side peer rather than a direct service competitor, but addresses the same Norwegian subsea customer base.

Direct peers

• Reach Subsea: Reach Subsea is a Bergen-based subsea services provider offering ROV-based survey, inspection, and light construction in Norwegian and Nordic waters. Closely comparable in service mix to Seløy, though Reach is more survey-tilted and operates a younger vessel fleet.
• MMT Sweden (Marin Mätteknik): MMT is a Nordic hydrographic and geophysical survey specialist with overlapping multibeam, sub-bottom, and cable route survey capabilities with Seløy's sister company Scansub; both serve similar offshore wind, subsea cable, and infrastructure clients in Northern Europe.
• Helgeland Dykk & Anleggsservice: Helgeland Dykk is a small Norwegian diving and underwater services contractor based in northern Norway offering diving, ROV, and marine construction—very comparable in size, geography, and service mix to Seløy.

Broad incumbents

• Aker Solutions: Aker Solutions is a large Norwegian provider of subsea production systems, umbilicals, and installation services for oil & gas and offshore wind. It competes with Seløy on subsea hardware installation scopes but operates at a fundamentally different scale and scope.
• Oceaneering International: Oceaneering is a global subsea robotics, ROV, and intervention services provider with Norwegian operations. It is far larger and globally diversified but overlaps with Seløy on ROV-based inspection and intervention work for offshore and aquaculture clients.
• DeepOcean: DeepOcean is a Norway-based subsea services company offering survey, IMR, trenching, and cable/pipeline installation—directly comparable service lines to Seløy, but operating a much larger fleet across the North Sea and beyond.
• Subsea7: Subsea7 is a global leader in subsea engineering, construction, and cable/pipeline installation for the offshore energy industry. While far larger, it overlaps with Seløy on submarine cable lay scopes that Seløy executes at smaller scale along the Norwegian coast.
• DOF Group (formerly DOF Subsea): DOF is a large Norwegian offshore and subsea services operator offering IMR, subsea construction, diving, and ROV services. It competes with Seløy in subsea installation and inspection, but at significantly larger scale and global footprint; Seløy sits as a small regional counterpart in Norwegian coastal waters.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/seloyundervannsservice

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

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 Seløy Undervannsservice