marine construction

Coleman Marine delivers a full suite of marine construction and support services tailored to coastal, offshore, and infrastructure environments. Our team brings decades of experience across civil works, piling, dredging, and logistics using our own fleet of purpose-built barges, workboats, and plant.

Whether it’s complex jetty remediation, offshore material transport, dredging operations, or floating pontoon builds we apply industry best practice, robust project management, and a strong commitment to environmental and workplace safety.

  • Piling & Structural Works

    Installation of steel, timber, and concrete piles, plus structural repairs and marine foundation solutions.

    Jetty Construction & Repairs

    End-to-end build and remediation of public and private jetties, wharves, and marine access points.

    Dredging & Excavation

    Coastal and marina dredging services to restore water access and maintain channel depths.

    Pontoon Installations

    Custom floating pontoon systems for councils, marinas, and private developments.

    Marine Electrical Installations

    Setup and maintenance of electrical infrastructure for jetties, pontoons, navigation aids, and marine facilities.

  • Crew Transfer & Work Vessels

    Certified vessels for safe transport of crew, contractors, and gear to offshore and island locations.

    Tugging & Towing Operations

    Vessel relocation and transport of barges, pontoons, and floating structures.

    Vessel Transport & Shipping

    Support Logistics support for marine construction, including barge hire, vessel transfers, and offshore coordination.

    Marine Logistics & Freight

    Material handling and marine freight services, including access to remote sites and islands.

    Yacht & Pleasure Craft Assistance

    Technical support, transport, and inspection services for private vessels and commercial yachts.

  • Project Management & Reporting

    Full-service project oversight including scheduling, compliance, stakeholder communication, and reporting.

    Insurance & Emergency Work

    Responsive support for insurance claims, damage assessments, emergency salvage, and repairs.

commercial diving

  • Underwater Welding & Cutting
    Expert welding and thermal cutting for structural repairs, demolition, and new marine construction work.

    Subsea Construction & Demolition Assist
    Diver-led support for underwater installation, removal, and construction site preparation across marine and inland projects.

    Bridge, Dam & Reservoir Diving
    Specialist diving for confined and low-visibility environments including bridge footings, reservoir infrastructure, and dam inspections.

  • Hull Cleaning & Inspection
    Marine growth removal, propeller clearing, and condition assessment for vessels, barges, and commercial craft.

    Anode Replacement
    Underwater replacement of sacrificial and impressed current anodes to protect marine assets from corrosion.

    Denso Pile Wrapping
    Corrosion protection for submerged piles using Denso tape systems, applied by trained dive teams.

    Tank Cleaning & Confined Space Work
    Internal cleaning, inspection, and maintenance of tanks and compartments in marine or industrial settings.

    Mooring Installation & Maintenance
    Deployment, servicing, and repairs for swing moorings, marina setups, and aquaculture anchoring systems.

  • Video Surveys & Audio Reporting
    High-quality diver footage with voice-over documentation for infrastructure reporting, compliance, and asset management.

    Structural & Seabed Inspections
    Comprehensive diver assessments of jetties, piers, and seabeds, including debris checks, erosion, and structural damage.

    Contaminated Environment Diving & Sampling
    Safe operations in hazardous or low-visibility conditions, including sediment sampling and environmental monitoring.

  • Emergency Response & Salvage (24/7)
    Rapid deployment for vessel salvage, urgent repairs, flood response, and underwater hazards day or night.

    Recovery, Retrieval & Rigging
    Lift-bag and diver-assisted retrieval of lost equipment, chains, anchors, tools, or submerged assets.

    Aquaculture Support & Maintenance
    Diving services for net inspections, mooring checks, pen cleaning, and fish welfare across aquaculture operations.

    Marine Life Assistance
    Support for safe detangling, relocation, or monitoring of marine species during underwater works.

Under the Southern Ocean Dive & Marine banner, our certified commercial divers provide expert underwater support for maintenance, inspection, and construction projects.

Available 24/7, our dive team is ADAS-accredited, fully insured, and backed by decades of combined industry experience. From deep water infrastructure to aquaculture, emergency salvage, and hull cleaning, we ensure every dive is completed with precision, safety, and care.

A black and white photo of a harbor with ships, a dock, and a building with a long corrugated roof over the docked area. Several cars and trucks are on the dock, and cranes are nearby. An island is visible in the distance across the water.

equipment

At Coleman Marine, our operations are backed by a fleet of specialised, marine-grade equipment purpose-built for construction, diving, dredging, and offshore support. From agile crew transfer vessels and heavy-duty barges to underwater ROVs and precision excavation systems, our machinery enables us to operate safely and efficiently even in the most challenging coastal and offshore environments.

A boat docked at a pier on a calm body of water, with a distant shoreline and cloudy sky in the background.

Rikie Rene

  • A high-performance 11.2m aluminium catamaran, Rikie Renee serves as our primary crew transfer and dive support vessel.

    • Twin 500HP Volvo D9 engines

    • Twin Hamilton Jet propulsion

    • 35 knots top speed

    • Capacity for 8 passengers

    Its rapid manoeuvrability makes it ideal for shallow coastal sites and emergency access the perfect work platform for dive operations.

Barge NimNat

  • A 20m x 5.4m steel barge, perfect for transporting heavy loads and supporting offshore operations like piling and dredging.

    • 40T capacity

    • Surveyed for marine works

    • Equipped with A-frame & 20T winch

A black and white photo of a compact construction excavator with caterpillar tracks, positioned on rocky ground by a body of water, with a landscape of trees and buildings in the background.

Excavator

  • Caterpillar 8T Excavator

    Our 8-tonne Caterpillar excavator is a core asset in both land-based and floating marine construction environments. Compact yet powerful, this tracked unit is optimised for barge deployment, allowing us to perform critical works directly from the water even in tight or remote access locations.

    Equipped with a range of attachments and precision controls, the excavator is frequently used in:

    • Dredging and sediment removal

    • Sheet piling and trenching

    • Pre-fabrication earthworks and site prep

    • Pile extraction and mooring foundation clearing

    Its compatibility with barge loading ramps makes it ideal for island, marina, and foreshore projects where land access is limited.

LASTOVO S

  • A robust 21.2m steel work vessel built for versatility and strength, Lastovo S is an essential asset in Coleman Marine’s operations.

    • Power Finger Hiab crane – lifts up to 1,700 kg at a 14m reach

    • Class 3B vessel – certified to carry up to 8 crew

    • Gross tonnage: 58.4 | Draft: 2.9m

    Designed for demanding marine environments, Lastovo S supports a wide range of operations including:

    • Towing and pushing barges

    • Piling and marine construction support

    • Anchor and mooring operations

    • Dive operations and offshore logistics

    With its stability, lifting power, and multi-role capabilities, Lastovo S delivers reliable performance across construction, salvage, and support projects throughout South Australia’s waters.

PROJECTS

  • Jetty Assessment

    Diving and engineering assessments will be carried out on Arno Bay’s jetty structure, with video reporting and remediation planning.

  • Ferry Terminal - Denso Wrapping

    As part of our ongoing work with SeaLink, our dive team delivered corrosion protection services at the Cape Jervis Ferry Terminal. Using ADAS-certified divers and specialised underwater equipment, we applied Denso wrapping to critical pile structures to extend the life and safety of the terminal.

    Fiberoptic Cable Lay

    Our team supported the successful subsea installation of a regional fiberoptic cable system at Cape Jervis. This included dive support, seabed coordination, and safety oversight during the cable lay process contributing to improved connectivity for the surrounding region.

  • Ferry Terminal - Denso Wrapping

    At Penneshaw, Coleman Marine conducted Denso pile wrapping operations as part of infrastructure upgrades for the ferry terminal. This corrosion protection work was completed by our commercial diving team using high-grade Denso materials and underwater wrapping techniques.

    Ferry Terminal – Seabed Collar Installation

    Coleman Marine designed and installed custom seabed structural collars to support pile integrity and longevity at the Penneshaw terminal. This work formed part of broader improvement works across SeaLink’s marine assets.

  • Flinders Ports Pile Replacement

    We're preparing for a pile replacement program for Flinders Ports infrastructure in Port Lincoln, including underwater cutting and commercial dive support.

    Port Lincoln Council Pontoon Repairs

    Full piling and structural upgrade.

  • Jetty Remediations

    Structural improvements and anode work

    Boat Ramp Hinge Manufacture & Replacement

    Coleman Marine completed precision fabrication and installation of new hinges at Port Neil’s boat ramp, enhancing access and improving safety for local marine users.

    Ramp & Basin Dredging

    Coleman Marine will undertake dredging operations at Port Neill to improve access at the boat ramp and surrounding basin. The work will involve material excavation, sediment relocation, and channel profiling, supported by our barge-mounted machinery and logistics team.

  • Jetty Remediations

    Structural improvements and anode work.

    Dredging Operations

    Our team is set to begin dredging works at Tumby Bay Marina to restore safe and reliable access for recreational and commercial vessels. Using our steel barge and excavator setup, we’ll remove built-up sediment and reshape the channel to meet access requirements.