What Immontec does

IMMONTEC BV is a Netherlands-based specialist engineering contractor providing immersion and structural monitoring solutions for complex civil infrastructure projects. Founded in 1995 as Strukton Immersion Projects (SIMP) and spun off as an independent management-owned entity on December 15, 2023, the company serves main contractors and government infrastructure owners across Europe, Asia, and North America. Its work centers on immersed tunnels, offshore wind and bridge foundations, atmospheric underwater habitats, and structural monitoring, with a project roster that includes the Scheldt Tunnel in Antwerp, the 1915 Çanakkale Bridge, the Busan Geoje Fixed Link, the MOSE flood barrier in Venice, and the Blyth Offshore Wind Demonstrator.

The company delivers its services through its proprietary OTAO® methodology — a registered trademark since 1995 covering the Floatation, Transporting, Immersion, and Sandflowing of tunnel elements — combined with an integrated suite of precision positioning technologies. Notable technical assets include the External Positioning System (EPS) for autonomous fine-positioning under extreme conditions, remote-controlled ballast systems capable of distributing 1,200–1,300 cubic meters of water per hour, advanced multi-sensor survey systems (Total Station, GNSS, USBL, FOG, INS, taut wire), and inflatable atmospheric habitats for dry underwater workspaces. The firm holds ISO 9001, ISO 14001, ISO 45001, and VCA** certifications, supporting its positioning as a quality- and safety-focused specialist.

IMMONTEC operates as a project-based professional services business, generating revenue through direct enterprise contracts with main contractors for specific immersion operations and monitoring engagements. The company employs approximately 23 specialists with combined experience exceeding 450 years, operates across 10 countries, and has completed more than 100 immersion operations and 150 monitoring projects since inception. Its go-to-market is enterprise field sales targeting major infrastructure tenders, supplemented by thought leadership at industry conferences such as the ITA World Tunnel Congress and co-marketing partnerships with engineering consultancies including Ramboll, Ballast Nedam, MH Poly Consultants, and TEC Tunnel Engineering Consultants.

Name

Immontec

Legal name

IMMONTEC BV

Website

https://immontec.com

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

11–50 employees

Short description

IMMONTEC BV is a Dutch specialist contractor providing immersion engineering and structural monitoring services for large-scale civil infrastructure projects, including immersed tunnels, offshore wind foundations, and bridge caissons, serving main contractors and government clients across Europe, Asia, and North America.

Ownership category

akta.pro rank

Headquarters

HQ city

Utrecht

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Project-Based Engineering and Execution Services: IMMONTEC provides specialized engineering, preparation, and execution services for immersion operations, monitoring, and positioning on civil infrastructure projects. Revenue is generated through direct contracts with main contractors for specific project phases or full OTAO® operations. Services include design, temporary works engineering, flotation, transport, immersion, sandflow foundation, monitoring installation, and positioning services.
2. Monitoring Systems and Solutions: Design, installation, and management of integrated monitoring systems for existing and new civil engineering infrastructure. Includes monitoring coordination, system installation, data management, and reporting services.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

IMMONTEC provides specialist engineering, preparation, and execution services for tunnel immersion operations, marine foundation installation, underwater habitat construction, and structural monitoring and positioning in large-scale civil infrastructure projects. Its flagship is the OTAO® process — a registered trademark since 1995 covering Floatation, Transporting, Immersion, and Sandflowing of tunnel elements — applied on immersed tunnels, bridges, offshore wind foundations, and flood barrier projects for main contractors and government clients worldwide.

Product overview

IMMONTEC is a specialist provider of immersion and monitoring solutions for civil infrastructure. The company offers a comprehensive portfolio organized around six core service areas: Immersion Tunnels (using the proprietary OTAO® process), Foundations (for wind turbines, bridges, and platforms), Habitat Constructions (underwater habitats at atmospheric pressure), Monitoring (structural health, deformation, and environmental monitoring), Positioning (precision measurement and alignment), and Design & Advice. The company also develops innovative technologies including the External Positioning System (EPS), Remote Controlled Tunnel Immersion systems, and Wireless Control Ballast Systems. IMMONTEC was rebranded in December 2023 from Strukton Immersion Projects and operates projects across Europe, Asia, and North America.

Differentiator

Problem solved

Functional benefit

Products and services

• Immersion Tunnels (OTAO®) Engineering, preparation, and execution of immersed tunnel installation for main contractors of road, rail, and subway tunnel projects. The service covers the complete OTAO® operation (Flotation, Transporting, Immersion, Sandflowing) plus temporary works engineering and risk analysis. Customers are main contractors delivering large-scale immersed tunnel infrastructure.
• Foundations (Wind Turbine, Bridge, Platform) Engineering, preparation, and maritime execution for installation of Gravity Based Foundations for offshore wind turbines, bridge caissons, and platform foundations. Includes the method for installing GBFs without floating cranes or traditional lifting equipment, achieving 5-10 cm vertical accuracy. Customers are offshore wind developers and EPC contractors.
• Habitat Constructions Engineering, preparation, and execution of underwater habitat structures that create dry working environments at atmospheric pressure for inspections, maintenance, and emergency repairs below the water surface. Uses inflatable rubber seal technology (atmospheric habitat). Customers are public infrastructure owners and operators.
• Monitoring Comprehensive civil infrastructure monitoring solutions including excavation pit monitoring, rail monitoring, asset management, satellite deformation monitoring, and field trials using analog, digital, or optical sensors. Covers design, installation, data management, and reporting. Customers are infrastructure owners, contractors, and public authorities.
• Positioning Precision positioning services for installation of caissons, tunnels, and foundations using advanced survey systems (Total Station, GNSS/GPS, USBL, FOG, INS, taut wire, camera, pressure/force, and tilt sensors). Delivers millimetre-level positioning accuracy in challenging marine environments. Customers are main contractors on immersion and foundation projects.
• Design & Advice Expert design and advisory services for complex immersed tunnel and marine construction projects, including comprehensive monitoring coordination, risk management, and the Observational Method approach. Customers are main contractors, developers, and public owners planning large-scale immersion or foundation projects.

Quantifiable outcome

• 104 successful operations completed worldwide
• +4 more outcomes

Named customers12 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

Feature7 records

Partnerships

Eleven partnerships are on record, tiered core and major.

• RambollcoreStrategic or Co-development Partner · 1 May 2026Engineering consultancy partner co-exhibiting with IMMONTEC at ITA World Tunnel Congress 2026 (WTC2026) in Montréal, presenting latest developments in immersed tunnelling alongside other industry partners.
• Ballast NedamcoreStrategic or Co-development Partner · 1 May 2026Construction company partner co-exhibiting with IMMONTEC at WTC2026 in Montréal, representing Dutch infrastructure expertise in immersed tunnelling presentations and discussions.
• MH Poly Consultants and EngineerscoreStrategic or Co-development Partner · 1 May 2026Partner co-exhibiting at WTC2026, contributing to industry knowledge exchange on immersed tunnelling as sustainable and efficient alternative to bored tunnels.
• TEC Tunnel Engineering ConsultantscoreStrategic or Co-development Partner · 1 May 2026Partner co-exhibiting at WTC2026, engaged in technical sessions and discussions on latest developments in immersed and floating tunnel technology.
• Multraship Towage & SalvagemajorImplementation/ SI/ Consulting PartnerMaritime partner providing tugboat services for tunnel element transport in the Scheldt Tunnel project. Towing tunnel elements from Doeldok to immersion site near Antwerp.
• MARIN (Maritime Research Institute Netherlands)majorStrategic or Co-development PartnerResearch partner conducting hydrodynamic simulations for tunnel immersion operations, providing insights into flow dynamics and tunnel element behaviour during immersion process (Scheldt Tunnel project).
• IMDC (International Marine & Dredging Consulting)majorStrategic or Co-development PartnerConsulting partner providing hydrodynamic analyses for tunnel immersion planning and execution (Scheldt Tunnel project).
• NPSE (Nautical Project Support & Engineering)majorImplementation/ SI/ Consulting PartnerEngineering partner providing nautical project support during complex immersion operations (Scheldt Tunnel project).
• Wayss & Freytag Ingenieurbau AGmajorImplementation/ SI/ Consulting PartnerMain contractor partner for A281 Wesertunnel in Bremen project. IMMONTEC coordinating and managing immersion operations while Wayss & Freytag handles general construction.
• BAM Nuttall Limited & BAM Infra B.V.majorImplementation/ SI/ Consulting PartnerClient for Blyth Offshore Wind Demonstrator project. BAM built gravity based foundations; IMMONTEC handled temporary works engineering and full operations for floating, transport, and offshore installation.
• TM COTU (Combinatie Oosterweel Tunnel)majorImplementation/ SI/ Consulting PartnerMain contractor for Scheldt Tunnel (Oosterweelverbinding) project in Antwerp. IMMONTEC responsible for coordinating and managing immersion operations under project manager and Immersion Commander Auke Lubach.

Scale indicators6 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Van Oord: Van Oord is a Dutch marine contractor active in offshore wind foundation installation, dredging, and coastal infrastructure. Comparable to Immontec in offshore foundation work and marine construction, but at substantially larger scale and broader service portfolio.
• Ramboll: Ramboll is a major engineering consultancy with significant immersed tunnel design expertise (WTC2026 partner of Immontec). Comparable in immersed tunnel domain expertise, though Ramboll operates at much larger scale across broader engineering disciplines.
• DEME Group: DEME is a Belgian marine contractor involved in offshore wind, dredging, and immersed tunnel projects across Europe. Directly comparable to Immontec in marine construction and offshore foundations, with much larger balance sheet and fleet.
• Royal Boskalis Westminster: Royal Boskalis Westminster is a large Dutch marine contractor with significant immersed tunnel and offshore foundation work. Directly comparable to Immontec as a marine construction specialist, but operates at much larger scale across dredging, offshore energy, and maritime services.
• Strabag: Strabag is a major European construction group with immersed tunnel experience via subsidiaries. Comparable to Immontec as a contractor on immersed tunnel projects, but operates across a much broader civil engineering portfolio.
• Jan De Nul Group: Jan De Nul is a Belgian marine and civil contractor active in immersed tunnels (e.g., experience on European tunnel projects), offshore wind foundations, and dredging. Closely comparable to Immontec in marine construction scope but at substantially larger scale.

Emerging players

• MH Poly Consultants & Engineers: MH Poly is a Dutch engineering consultancy focused on immersed tunnels (WTC2026 partner of Immontec). Comparable as a specialist in the same niche, though operating in consulting rather than execution services.
• TEC Tunnel Engineering Consultants: TEC is a Dutch immersed-tunnel engineering consultancy and WTC2026 partner of Immontec. Comparable in immersed tunnel expertise, though operating primarily in design/consulting rather than execution services.

Direct peers

• Ballast Nedam: Ballast Nedam is a Dutch construction firm actively involved in immersed tunnel projects (a WTC2026 partner of Immontec). Directly comparable as a contractor on similar immersed tunnel projects in the Dutch market.
• Wayss & Freytag Ingenieurbüro AG: Wayss & Freytag is a German specialist contractor with deep immersed tunnel expertise (A281 Wesertunnel project customer of Immontec). Directly comparable as a tunnel immersion contractor serving European infrastructure projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@immontec
• LinkedInlinkedin.com/company/immontec

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 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 Immontec