OSC Marine is a maritime service company delivering commercial diving, ship husbandry, offshore rig support, civil marine construction, and salvage services. We combine IMCA-aligned systems, qualified personnel, and fit-for-purpose equipment to support vessels and offshore assets from port and OPL (Off Port Limit) operations to nearshore and offshore projects.
Diving Capabilities & Technical Expertise
OSC Marine delivers both shallow-water operational support and advanced commercial diving solutions for complex marine environments.
Commercial diver technical strengths:
- Diving operations to depths of 300 m
- Hyperbaric wet underwater welding for in-water structural repairs
- Hyperbaric dry welding using cofferdams/habitats for hull, pipeline, and jacket repair
- Advanced CCTV editing and report writing for clear documentation
- Redundancy of key equipment to protect schedule and safety
- Strategic equipment coverage based on site needs
- Dry flexible in-water repair solutions for practical restoration work
- Ability to write procedures for coded welding
- Operational flexibility across water bodies: reservoirs, lakes, rivers, and sea
Why Choose OSC Marine Commercial Divers
Choosing a maritime diving contractor is about certainty, speed, and capability. OSC Marine is built for operational reliability especially when time and asset availability matter.
Client benefits:
- Proven capability working at OPL (Off Port Limit)
- Rapid emergency response and enquiries
- Reliable delivery of the requested underwater service
- Correct equipment for specialist needs
- Competent commercial divers and experienced personnel
- Strong turnaround time and a performance focus
- Collaborative working relationships with agents and clients
Core Maritime Diving Services
Ship Husbandry Commercial Diving
OSC Marine supports vessel owners, managers, agents, and ports with reliable underwater maintenance and inspection services designed to reduce downtime and improve turnaround time. Typical outcomes include reduced biofouling, improved propulsive efficiency, verified underwater condition, and faster port calls through dependable dive support.
Key ship husbandry diving capabilities:
- Single-diver surface supplied system (depth capability up to 24 m)
- Trailer or boat-based deployment for flexible port and nearshore operations
- Diver CCTV with editing capability for clear evidence and reporting
- Underwater tooling: welding, cutting, and blanking equipment
- Specialized hull cleaning using ROV and manned technologies
- Brush cart with hydraulic reel and compliant filtration system
- Underwater propeller repair using a propeller bending tool
- Consumables and spares (including Ethylene-Vinyl Acetate (EVA/EBA) foam)
- Diving equipment compliance and readiness for operational requirements
- Environmental compliance alignment for hull cleaning registrations and standards
Oil & Gas (Rig Husbandry) & Offshore Diving Support
For offshore operators, OSC Marine provides containerised systems, competent project leadership, and locally based teams capable of sustained operational delivery. Designed for offshore inspection, repair and maintenance (IRM), asset integrity support, and operational continuity in demanding marine conditions.
Offshore diving and rig husbandry service highlights:
- Containerised air dive system, classed with Launch and Recovery Systems (LARS)
- High-quality video capture and editing for inspection evidence
- Self-sufficient local teams with in-country spares and technical capability
- HP water jetting and marine cleaning solutions
- Hydraulic power packs for subsea tooling and productivity
- IMCA-compliant personnel for offshore operations
- U-type certified divers for offshore inspections where required
- Emergency Pipeline Repair Support (EPRS)
- Daughter craft diving operations for FLNG and FPSO environments
Civils & Marine Construction Diving
OSC Marine supports civil and industrial marine projects requiring practical underwater diving construction capability and reliable on-site engineering support. Ideal for underwater concrete and steel works support, dredging assistance, intake/outfall work, underwater preparation, and marine infrastructure maintenance.
Civil construction diving capability:
- Single-diver surface supplied system (up to 24 m)
- Containerised chamber setup to support site safety and readiness
- Trailer/boat deployment for project access and mobility
- CCTV for observation and job oversight
- Experienced construction divers for marine works
- Survey equipment for positioning and underwater checks
- Portable hydraulic power packs and tools
- Portable cutting and welding assemblies
- Marine engineering diving services and support for problem-solving and productivity
- Subsea engineering: procedures, excavation, and site preparation
Salvage Diving & Emergency Response (24/7 Readiness)
OSC Marine provides salvage divers on 24/7 readiness, configurable for port, nearshore, or offshore conditions. Engage us for a tailored assessment and execution plan based on risk, urgency, and asset condition. We are dedicated to safe stabilization, controlled removal/transfer, and practical recovery strategies under defined safety controls.
Salvage diving scope and execution services:
- Survey, Assessment & Safety Planning
- Integrity Restoration & Leak Control
- Cargo Recovery & Subsea Intervention
- Cutting, Separation & Access
- Heavy Lift, Refloat & Integrated Operations
Safety, Compliance, Qualifications & Governance
Safety is designed into the system: personnel competence, certified equipment, proven procedures, and strict operational discipline.
Standards, certifications, and controls:
- Offshore divers require IDRCF (International Diving Regulators and Certifiers Forum) Offshore Diver certification from an accredited national body
- IMCA and class-approved equipment and management system for Air, Mixed Gas, and Saturation Diving
- Diver location services (topside view with diver warn unit)
- Classed approval for in-water hull inspections to IACS (International Association of Classification Societies) member requirements
- Local divers hold Department of Labour Class 2 or Class 3 certification (as applicable)
Core safety protocols:
- Chamber availability within 2 hours
- Enclosed helmets only
- All diving is surface supplied via umbilicals using IMCA-compliant D040 and D023 systems
- Trained personnel and trained supervisors
- Active participation in a Diving Division Management Committee over many years
- IDRCF-compliant salvage divers for emergency and specialist operations
Diving Vessel Support & Marine Logistics
OSC Marine provides diving support vessels and platform support options to match operational scope, sea state, and worksite complexity.
Marine vessel support capabilities:
- Dynamically Positioned (DP) vessels and equipment for offshore IRM and construction work
- Floating plant, barges, and support services (including fleet OPL support)
- OSC Marine owned/operated diving support vessels: Daughter Craft (workboats), RHIBs, Platform Supply Vessels (PSVs), and more
- Support craft: small tugs and RHIBs (Rigid-Hulled Inflatable Boats)
If you need a maritime diving partner for planned maintenance, urgent underwater repairs, offshore IRM support, or salvage response, contact us to mobilize the right system, people, and craft to meet the job scope safely and efficiently.
Frequently Asked Questions
What is a commercial diver?
A commercial diver is a trained professional who works underwater to perform tasks such as construction, inspection, maintenance, welding, and repair on marine and subsea structures. These divers operate in environments like oceans, rivers, dams, and ports, using specialized equipment to safely complete technical work below the surface.
OSC Marine provides highly trained and certified commercial divers capable of delivering these services across offshore, port, and inland water environments.
What is a cofferdam?
A cofferdam is a watertight enclosure built around an underwater work area to remove water and create a dry working environment. In commercial diving, cofferdams are used to enable hyperbaric dry welding and repairs on structures like ship hulls, pipelines, and offshore platforms.
OSC Marine designs and implements cofferdam and habitat solutions to perform high-integrity dry underwater repairs safely and efficiently.
What does IMCA stand for?
IMCA stands for the International Marine Contractors Association. It is a global organization that sets safety, operational, and technical standards for offshore marine contracting, including commercial diving.
OSC Marine operates in accordance with IMCA-compliant systems and procedures, ensuring industry-standard safety and performance across all diving operations.
What are the types of commercial diving?
The main types of commercial diving include:
- Air Diving – Standard diving using compressed air, typically for shallower depths
- Mixed Gas Diving – Uses gas mixtures like heliox for deeper or longer-duration dives
- Saturation Diving – Divers live in pressurized environments for extended deep operations
- Surface-Supplied Diving – Divers receive air and communication through an umbilical
- SCUBA Diving – Self-contained breathing system, usually for light or shallow tasks
OSC Marine is fully equipped to perform air, mixed gas, and saturation diving operations, including deep diving projects to depths of up to 300 meters.
What is a diving bell?
A diving bell is a pressurized chamber used to transport divers safely to and from deep underwater work sites. It maintains internal pressure and provides a controlled environment, often used in saturation diving operations to reduce decompression risk.
OSC Marine supports advanced diving operations where diving bells and related systems are required for safe deep-water intervention.
How do you weld underwater?
Underwater welding is performed using specialized techniques and equipment:
- Wet Welding – The diver welds directly in the water using waterproof electrodes
- Dry (Hyperbaric) Welding – Welding is performed inside a sealed chamber (such as a cofferdam) where water is removed
Before welding, the surface is cleaned to ensure strong bonding. Dry welding typically produces higher-quality results due to controlled conditions.
OSC Marine offers both hyperbaric wet and dry welding services, using advanced equipment and certified procedures for structural repairs.
What types of underwater repairs can commercial divers perform?
Commercial divers can perform a wide range of underwater repairs, including:
- Structural repairs on ship hulls, pipelines, and offshore platforms
- Welding and cutting, including precision methods like diamond wire cutting
- Hull cleaning and propeller repairs
- Leak sealing and temporary patching
- Cathodic protection system installation and repair
- Concrete and structural rehabilitation (bridges, bulkheads, dams)
These services help extend asset life, improve safety, and minimize operational downtime.
OSC Marine delivers all of these underwater repair solutions with certified divers, in-house equipment, and proven offshore methodologies, ensuring reliable results in even the most challenging environments.