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Marinecrete Mattresses ("Marinematts")

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Carbon Negative Subsea Protection

Page last modified
Thursday, July 14, 2022 - 14:37

Marinecrete mattresses (Marinematts) are pre-cast eco-friendly low/negative CO2 concrete structures that protect man made subsea assets whilst enhancing the marine environment due to their cavities, pH and surface texture. They are non-toxic, contain no Portland cement, zero plastics and are made with >95% recycled materials supporting the circular economy.   Standard Marinecrete mattress measure 6x3m 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. There use supports UN goal SDG-14 life below water.

Marinematts are designed to become the defacto standard for protecting cables, pipelines and monopiles due to their massive CO2 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 rewild the oceans and provide hard substrate to regenerate ocean health. 


90% lower CO2 footprint
Non-toxic to marine environment
Zero plastics
Made from 100% recycled materials
Proven eco-system enhancement
Supports SDG-14 life below water
Reduced life cycle costs if not recovered
Eliminates HSE risks if not recovered
Deployment track record to date weak
OSPAR yet to accept as suitable for long term deployment without recovery liability


Areas of Application Cable and pipeline protection, scour protection, habitat enhancement, anti-bottom trawling deterrent for MPAs.
Capabilities Global deployment strategy through licensing agreements. ARC Marine offer full reef planning, execution, monitoring and stewardship support
Compliance Nature inclusive design, formal marine concrete and lifting specification approvals pending.
Deployment Compatible with traditional deployment techniques e.g. Block grabber, lifting frames, fall pipe and tremie pipe units.
Environment Non-toxic to marine environment. Low CO2, zero plastics. Supports circular economy and SDG-14 life below water.
Lifespan Designed to be permanent (500 years+) but can be made with finite biodegradable materials for certain applications.
Material 100% recycled materials, zero plastics, 90% lower CO2 than Portland cement. Densities, surface textures and colour all configurable.
Modular design Building blocks from 15cm to 1.5m in height can be combined into complex structures. Variants for specific marine species e.g. Native oyster (Ostrea Edulis).
Patents Patent granted UK and pending in target countries including US, China and Brazil.
Protection 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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Technology Readiness Level


Development Technology demonstration Mature / Proven
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About ARC Marine Ltd

ARC Marine is an eco-engineering company specialising in low CO2 high impact marine materials for subsea protection, coastal defence and 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, Marinematts and Reef Cubes® and the monitoring and long-term custodianship of new reefs.

Applications include coastal defense, offshore energy, eco-tourism, aquaculture, moorings, habitat enhancement and anti-bottom trawling deterrents in marine protected areas. Our product is non-toxic, contains no plastics and can be made locally using sustainably sourced aggregates and recycled materials, creating jobs in the communities impacted.

+44 (0) 1803 659195
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