Marine Civil Construction Brisbane| Commercial Marine Group



Purchased by CMG in 2020, the Diving Support Vessel (DSV) Poseidon was originally a purpose-built dive vessel for the Royal Australian Navy in 1996 – named Malu Baizam. She served predominately around Thursday Island until relocating to HMAS Cairns in 2010 to assist after cyclones Neville and Olga. CMG renamed her in an unofficial Navy ceremony on 12 September 2020 at HMAS Moreton (Brisbane).

With twin MTU (Mercedes) turbo charged marine diesel engines, DSV Poseidon is a powerful vessel. CMG has replaced all communication and navigational equipment to ensure optimal performance in any conditions.

DSV Poseidon has a high-performance air compressor, large deck capacity, berthing for seven (7) and full kitchen/living area – meaning she can operate off-shore for many days.

DSV Poseidon will predominately be used to clean ship hulls. Housing the latest technology in underwater ship cleaning, the Smart Kart (with custom built hydraulic power pack), CMG can quickly and efficiently groom and fully clean ship hulls and niche areas in-water. With inbuilt CCTV footage available in the wheelhouse, crew and Clients can watch real time as inspections and cleaning operations take place, whether onboard or from a remote location.

Her offshore capabilities make DSV Poseidon a truly diverse diving vessel, with options for seabed surveys, search and recovery projects, ROV operations, scientific research and other niche subsea projects.



CMG’s Guardian is a fiberglass RHIB (rigid-hull inflatable boat) and perfect as a support vessel for DSV Poseidon, or, stand alone on mooring projects along the East Coast of Australia. Guardian is an ex-Australian Navy vessel and perfect for commercial diving operations. Her 150kW Volvo Penta 200HP Turbo Diesel engines means she can power into open ocean and effortlessly manoeuvre swell and surf. With 2D and 2C restricted classifications, Guardian is a versatile vessel.

Notable projects include:

  • VR4G Shark Buoy Maintenance and Inspection contract (SharkSmart NSW) – servicing 21 shark buoys along the NSW east coast. 2021 will be her 5th year servicing this contract.
  • Mooring inspections and maintenance in Moreton Bay
  • Kingsford Smith Drive Upgrade Project


Invictus is a 9.72m aluminium work vessel. Previously part of the Queensland Parks fleet, Invictus has twin 250HP outboard Suzuki motors. She has a shallow draft, meaning she is perfect for working under bridges and in shallow waters on marine civil construction projects.

Invictus has worked at many locations in the Brisbane River, most recently:

  • Kingsford Smith Drive Upgrade Project
  • Brisbane City Council Ferry Terminal inspections
  • BP Port North Pipeline
  • Graincorp Terminal
  • Ampol (recently Caltex) Terminal
  • Incitec Pivot Terminal

Invictus has a large 3.5 tonne deck load capacity, one tonne hiab and remote ramp door, making her the perfect work platform for pile remediation and inspection projects. Invictus has also worked for CMG in the Whitsundays providing transfer services for Queensland Parks personnel and equipment. She has also completed many projects in Moreton Bay including mooring inspections at Flinders Reef and Flat Rock, and been the diving support vessel for underwater welding works on the Tangalooma Wrecks.



Vigilant is a similar work vessel to Invictus, with a slightly smaller length of 7.96m. Her deck capacity is also smaller at one tonne, with a one tonne hiab. With a remote ramp door, Vigilant works on many of the Brisbane River civil projects. Her smaller profile means she is even better equipped at accessing tight spaces, especially under ferry terminals, wharfs and jetties.

Vigilant has been moved by road to work on other key interstate marine civil projects such as the Eden Breakwater Upgrade Project in Eden, NSW and the Mayfield Berth Upgrade in Newcastle, NSW.