reef cubes®

reef cubes® are designed to support and protect life on our seafloor and coastlines and can be utilised across various industries, including aquaculture, coastal defence, reef conservation, eco-engineering and subsea protection. Manufactured solely from marine-friendly materials, reef cubes are an award-winning product that offers a construction that’s kind to the environment and a design that enhances biodiversity and is scientifically backed. Whether you’re looking for nature-inclusive scour protection for monopiles or coastal defence, or you’re looking for biodiversity enhancement for your aquaculture or ecotourism site, reef cubes provide a revolutionary marine-friendly solution.

Building blocks for the ocean to enhance marine ecosystems

Boost biodiversity across your coastline with the world’s only low-carbon, plastic-free and 98% recycled solution for subsea protection and marine habitat restoration.

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Why choose reef cubes?

Enhance marine biodiversity

Scientifically proven to enhance marine biodiversity – the design and surface are chosen specifically to act as the perfect substrate for marine flora and fauna

Marine friendly materials

Manufactured solely from marine-friendly waste material – meaning you can ensure the long-term stewardship of man-made reef systems and ocean health for future generations

Lower CO2 emissions

91% reduction in CO₂ emissions – thanks to our alkali activation, advanced casting techniques & on-site manufacturing

Turn-key solution

ARC provide services from construction to deployment – allowing us to provide you with the most cost-effective service all the way

Recycled & plastic-free materials

98% recycled materials & plastic-free – meaning there are no harmful marine plastics introduced into the environment

Efficient structural configuration

Efficient structural configuration to transfer loads without excess materials

Alkali-activated material (AAM) binder used

Created from alkali-activated material (AAM) binder produced Marine Crete, which is of comparable and superior strength to ordinary Portland cement (OPC) but without the carbon footprint

Scalable design

Modular and stackable; allowing for structures of any size and scale

Find out more | Download the reef cube product sheet

Looking for more information on reef cubes? You can learn about their specification, details and more when you download our product sheet.

Fill out the form to download it now and find out how you can incorporate nature inclusive solutions to enhance marine ecosystems into your next project.


Frequently Asked Questions



What’s the minimum number of reef cubes I can order?



Does ARC Marine provide monitoring to track the ecosystem benefits to my project?



How does the process of buying reef cubes work?



How can reef cubes be installed?


ARC Technology

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“Kier have been very satisfied and pleased with ARC Marine throughout the preconstruction and construction stages of the Newlyn Tidal R&D project. ARC Marine have fabricated and delivered exceptional Intertidal reef cube® ECO armour units for the project where all parties, including Kier, the Environment Agency and Atkins, have been very impressed with the quality of finish of the units. Overall a very exceptional service from ARC Marine and would highly recommend.”

Jack Walker, Site Agent / Chartered Engineer, Kier Infrastructure – Regional Civil Engineering

“reef cubes® is a unique product that could reach a massive global market. Marine-i has been proud to help ARC Marine develop and test their amazing new approach to marine conservation and in particular, its application to marine renewable energy. Their pioneering products have the potential to improve the health of our oceans for generations to come.”

Alex Whatley, University of Plymouth

"ARC Marine are providing 25% of the reef blocks for the Newlyn project. Their blocks offer multi-functional benefits, such as biodiversity enhancing design and low-carbon fabrication. The development of viable alternatives to carbon intensive and non-sustainable solutions such as reinforced concrete, or quarried rock, is hugely important in order to meet the EA’s organisational targets to achieve net zero by 2030. More broadly, decarbonisation of the coastal and subsea infrastructure industry will also provide an important contribution to wider UK pledges on climate change."

Justin Ridgewell, Coastal Advisor for Cornwall and the Isles of Scilly, Environment Agency

“The idea of a carbon-neutral reef cube® that can be used to help rehabilitate reef ecosystems is exciting – we really need to do everything we can to give coral reefs a break”

Dr Sylvia Earle, National Geographic Explorer upon congratulating ARC Marine as an Ocean Impact Finalist, 2020.

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