Marinecrete Mattresses ("Marine Matts")

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2 Deploys

Carbon Neutral Plastic Free Subsea Protection

Page last modified
April 18 2024

Marine Matts are pre-cast eco-friendly carbon-neutral concrete structures that protect man-made subsea assets whilst enhancing the marine environment due to their cavities, pH and surface texture. They are certified non-toxic to the marine environment, contain no Portland cement, zero plastics and are made with 98% recycled materials supporting the circular economy. Standard Marine Matts measure 6mx3m, are 150mm, 300mm or 450mm deep and can be deployed using conventional lifting frames. They can be part of the energy transition to carbon net zero projects and support green recycle, repurpose, reuse strategies. Their use supports UN goal SDG-14 life below water and marine net gain (MNG) objectives by increasing biodiversity and species abundance.


Marine Matts are designed to become the defacto standard for protecting cables, pipelines and monopiles due to their massive carbon footprint saving, the potential life cycle cost saving (if approved to be left in situ) and nature-inclusive design benefits. They are recoverable so they can be moved and reused but designed with the potential to be approved by regulators to be left in situ forever due to their positive marine impact.  Every subsea and coastal defence project can now leave a positive marine legacy to help re-wild the oceans and provide hard substrate to regenerate ocean health. 

Pros & Limitations
Carbon neutral as standard, contains no Portland cement
Non-toxic to marine environment - passed stringent EU leachate test standards
Zero plastics - contains no polypropylene rope or plastic re-enforcement fibres in the mix, even paint used is polymer free
Made from 98% recycled materials - circular economy solution with verified secondary repurposing potential
Proven eco-system enhancement - nature inclusive design including lobster arches
Supports SDG-14 life below water and marine net gain objectives - corporate CSR win-win
Reduced life cycle costs if not recovered - BVG Report shows a 41% life cycle cost saving if permitted to remain in situ
Eliminates HSE risks if not recovered - recovery of conventional materials considered high risk due to mattress break-up & lifting
Deployment track record to date weak - first deployments scheduled Q4 2023
NSTA and other stakeholders yet to accept as suitable for long term deployment without recovery liability
Specification Title Specification Description
Areas of Application
Cable and pipeline protection, scour protection, habitat enhancement
Global deployment strategy through licensing agreements. ARC Marine offer full reef planning, execution, monitoring and stewardship support
Meets typical stability, impact and dropped object requirements. Certified non-toxic to the marine environment.
Compatible with traditional concrete mattress deployment techniques e.g. lifting frames for 6m x 3m mattresses
Non-toxic to marine environment, carbon neutral, zero plastics. Supports circular economy and SDG-14 life below water.
Designed to provide permanent hard substrate (500 years+) and a design life of 20 years.
98% recycled materials, zero plastics, carbon-neutral. Densities, surface textures and colour all configurable.
Modular design
Sizes: 6m x 3m as standard with mattress depths of 150mm, 300mm and 450mm
Protects both man made assets and the surrounding eco-systems. Does not suffer from leading edge flip over unlike traditional subsea mattresses. Stable and effective in shallow and deep water anti-scour service.


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ARC Marine is an award winning (2022 SPE Offshore Achievement Award for Emerging Technology, 2022 RWE Ecology Award) eco-engineering company specialising in low carbon footprint high impact marine materials for subsea cable/pipeline protection, scour protection, coastal defence, eco-friendly moorings and deliberate marine habitat enhancement.  Our patented product Reef Cubes® is made from Marinecrete® and creates sustainable eco-friendly marine habitats intended to benefit both people and the planet. Our expertise is in the design, manufacturing and deployment of Marinecrete, Marine Matts and Reef Cubes® and the monitoring and long-term custodianship of new ecosystems these help create. Further marine habitat enhancing products are under development.

Applications include coastal defence, offshore energy, eco-tourism, aquaculture, moorings, habitat enhancement and anti-bottom trawling deterrents in areas closed to such practises e.g. marine protected areas or around critical subsea infrastructure. Our products are non-toxic, contain no plastics and can be made locally using sustainably sourced aggregates and recycled materials, creating jobs in the communities impacted and minimising transportation carbon footprint.

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