Specialist Marine Construction, Repair & Infrastructure Solutions
OSC Marine delivers specialist marine construction services across South Africa, Sub-Saharan Africa, and international marine environments. Our multidisciplinary teams combine commercial diving, ROV operations, marine engineering, survey capabilities, heavy lifting, vessel support and specialist construction expertise to execute complex marine infrastructure projects safely, efficiently and with minimal operational disruption.
From ports and harbours to offshore assets, dams, reservoirs and subsea pipeline systems, we provide turnkey Engineering, Procurement, Construction, Installation and Maintenance (EPCIM) solutions throughout the full lifecycle of marine infrastructure.
Marine Construction Expertise Backed by Experience
With decades of combined marine construction experience, OSC Marine supports government agencies, port authorities, energy providers, mining operations, industrial facilities, desalination plants, offshore operators and infrastructure developers.
Our project teams include:
- Commercial divers and dive supervisors
- Marine construction specialists
- Offshore and subsea technicians
- ROV pilots and survey personnel
- Marine engineers and project managers
- Certified rigging and lifting specialists
- Inspection and NDT technicians
- Salvage and recovery experts
Our teams operate in challenging offshore, nearshore and inland-water environments while maintaining the highest standards of safety, quality and project control.
Plant, Equipment, Vessels & Marine Assets
OSC Marine maintains access to a wide range of specialist marine construction equipment, assets, and support vessels to meet project-specific requirements.
Our capabilities include:
- Construction barges and floating platforms
- Workboats and support vessels
- Offshore construction support vessels
- Diving support systems
- Remotely Operated Vehicles (ROVs)
- Hydrographic survey equipment
- Side-scan sonar and geophysical survey systems
- Crane barges and heavy lifting equipment
- Pile-driving equipment
- Dredging systems
- Marine welding and cutting equipment
- Hyperbaric and specialist intervention systems
- Pipeline installation and trenching equipment
- Anchoring and mooring installation systems
This combination of personnel, equipment and marine assets allows us to deliver integrated marine construction solutions across multiple sectors.
EPCIM Marine Construction Services
OSC Marine provides complete Engineering, Procurement, Construction, Installation and Maintenance (EPCIM) support for marine and offshore infrastructure throughout every project phase.
Our services include:
Engineering & Design
- Pre-construction design surveys
- Marine engineering and design development
- Constructability assessments
- Site investigations
- Hydrographic and geophysical surveying
- Seabed analysis and risk assessments
Procurement
- Specialist marine equipment sourcing
- Fabrication management
- Material supply and logistics coordination
- Marine component procurement
Construction & Installation
- Marine civil construction
- Subsea structure installation
- Offshore terminal construction
- Pipeline installation
- Mooring system installation
- Coastal infrastructure development
Maintenance & Lifecycle Preservation
- Asset inspections
- Preventative maintenance
- Structural rehabilitation
- Corrosion protection
- Lifecycle extension programmes
- Emergency repairs and interventions
Port, Harbour & Quayside Infrastructure
OSC Marine delivers specialist port and harbour construction services for new developments, upgrades, rehabilitation projects and operational marine facilities.
Our capabilities include:
- Port construction, expansion and rehabilitation
- Sheet-pile wall construction and installation
- Sheet-pile rectification, strengthening and repair
- Combi-wall construction
- Precast caisson installation
- Jetty, pier and wharf construction
- Piled quay wall construction
- Deck-on-pile structures
- Slipway and boat-ramp construction and rehabilitation
- Dolphin structure installation
- Quay-deck construction and repair
- Quay-wall inspection and strengthening
- Fender system installation, inspection and maintenance
- Guide-rail repair and replacement
- Track-rack removal
- Navigation buoy and channel marker installation
Our teams support commercial ports, industrial terminals, naval facilities, waterfront developments and marine logistics infrastructure.
Coastal Protection & Erosion Control
Coastal infrastructure is continually exposed to wave action, storm events, tidal fluctuations and erosion forces. OSC Marine provides engineered coastal protection solutions designed to preserve shoreline stability and protect critical assets.
Services include:
- Breakwater construction
- Groyne and coastal jetty construction
- Causeway construction
- Geotextile and geofabric installation
- Geotextile tube placement
- Sea-wall construction
- Rock revetment construction and rehabilitation
- Scour protection installation
- Shoreline stabilisation and remediation
Subsea Pipelines, Shore Crossings & Marine Outfalls
OSC Marine provides complete subsea pipeline construction and maintenance services for offshore, nearshore and industrial marine infrastructure.
Capabilities include:
- Seawater intake construction
- Desalination pipeline installation and maintenance
- HDPE pipeline installation and repair
- Marine outfall pipeline construction
- Subsea pipeline installation
- Bottom-pull pipeline installation
- Shore-crossing construction
- Subsea trenching and burial
- Pipeline stabilisation and protection
- Diffuser array installation
- Pipeline dredging and internal clearance
Our teams support desalination plants, power stations, industrial facilities, municipalities and offshore energy operations.
Underwater Structural Construction & Repair
OSC Marine performs complex underwater construction, rehabilitation and asset repair projects without requiring costly shutdowns or dewatering wherever possible.
Services include:
- Underwater cofferdam construction
- Underwater concrete shuttering
- Underwater concrete placement
- Concrete rehabilitation and underpinning
- Subsea grouting and cavity sealing
- Underwater welding
- Underwater cutting and coring
- Cathodic protection and anode replacement
- Pile and column rehabilitation
- Quay-wall and sheet-pile repair
- Underwater demolition
- Structural steel modification
- Marine mechanical installation
Dams, Reservoirs & Inland Water Infrastructure
OSC Marine supports water utilities, municipalities, industrial operators and infrastructure owners with specialist underwater construction and maintenance services.
Services include:
- Bell-mouth blanking
- Valve blanking and isolation
- Submerged valve replacement
- Sluice-gate and penstock installation
- Dam intake and suction clearance
- Minor dam dredging and desilting
- Reservoir quay-wall inspections and repairs
- Canal and lock-wall rehabilitation
- Intake tower construction and rehabilitation
- Dam and reservoir concrete repairs
- Submersible pump installation and recovery
Dredging, Desilting & Seabed Works
Our marine construction teams undertake both capital and maintenance dredging projects in ports, dams, reservoirs and industrial water facilities.
Services include:
- Capital dredging
- Maintenance dredging
- Precision dredging in confined environments
- Silt pond dredging
- Dam and reservoir desilting
- TBM exit-pit dredging
- Land reclamation and marine filling
- Seabed preparation and levelling
- Environmental silt curtain deployment
Marine Utilities, Anchoring & Mooring Systems
OSC Marine provides offshore mooring installation, maintenance and recovery solutions for marine utility systems and mooring infrastructure.
Services include:
- Subsea cable installation and repair
- Fibre-optic cable support
- Power cable installation
- Anchorage system installation
- Mooring system installation
- Anchor handling and recovery
- Deadweight and suction pile installation
Offshore Structures, Marine Terminals & Decommissioning
Our offshore construction capabilities support terminal developments, energy infrastructure, marine industrial facilities and decommissioning programmes.
Services include:
- Offshore terminal installation
- Subsea equipment installation
- Structural foundation installation
- Offshore construction support
- Marine asset retrofits and modifications
- Vessel modification support
- Rig modification support
- Subsea decommissioning
Offshore Installation, Subsea IRM & Pipeline Support
OSC Marine provides integrated offshore installation, subsea intervention, pipeline support and marine assurance services across the construction, commissioning, maintenance and decommissioning lifecycle.
Services include:
- Offshore installation support
- Subsea inspection, repair and maintenance (IRM)
- Pre-installation surveys
- As-laid and as-built surveys
- Pipeline route preparation
- Free-span correction
- Spool, jumper and tie-in installation
- Mattress, grout-bag and rock-placement support
- Pipeline crossing construction
- Shore approach and landfall works
- Riser, J-tube and I-tube support
- Single-point mooring (SPM) and CALM buoy systems
- Diving and ROV intervention
- Diving support vessel operations
- SIMOPS planning
- Marine assurance
- Installation engineering
- Lift engineering
- Commissioning and mechanical completion support
- Decommissioning, removal and site-clearance support
Salvage, Recovery & Hyperbaric Support
OSC Marine provides emergency and planned recovery operations for submerged assets across marine, industrial and infrastructure sectors.
Capabilities include:
- Equipment and vehicle salvage
- Submersible equipment recovery
- TBM recovery operations
- Hyperbaric support services
- Submerged obstruction removal
- Heavy underwater lifting
- Structural recovery operations
24/7 Emergency Response
Marine infrastructure failures can occur without warning. OSC Marine provides rapid-response emergency intervention services throughout South Africa and selected international locations.
Our emergency response teams assist with:
- Vessel groundings
- Structural failures
- Quay-wall collapses
- Sheet-pile failures
- Dam infrastructure emergencies
- Pipeline failures
- Mooring system failures
- Salvage and recovery operations
- Emergency inspections
- Storm damage assessments
- Submerged asset recovery
Our teams are available 24/7 to mobilise personnel, vessels, diving assets, ROV systems and specialist equipment for urgent marine incidents.
Engineering, Survey & Project Support
Every successful marine construction project begins with accurate engineering and project planning. OSC Marine provides the specialist support services required to de-risk marine projects and optimise construction outcomes.
Services include:
- Pre-construction design surveys
- Marine engineering and constructability reviews
- Hydrographic surveys
- Geophysical surveys
- Seabed investigations
- Construction-support diving
- ROV construction support
- Marine lifting and rigging
- Floating plant operations
- Inspection and quality control
- Non-destructive testing
- Turnkey project management
Why Choose OSC Marine?
- Turnkey EPCIM project delivery
- Experienced marine construction professionals
- Commercial diving and ROV capabilities
- Access to specialised vessels and floating plant
- Offshore, coastal and inland-water expertise
- Rapid mobilisation throughout Africa
- Strong safety and quality-management systems
- 24/7 emergency response capability
- Lifecycle support from design through maintenance
Speak to a Marine Construction Specialist
Whether you require port rehabilitation, subsea pipeline installation, coastal protection works, underwater repairs, dredging operations or emergency marine intervention, OSC Marine provides the expertise, equipment and project management capabilities to deliver safe and effective results in demanding marine environments.
Contact OSC Marine today to discuss your specialist marine construction requirements.