Intertidal reef cubes

Intertidal reef cubes help you to protect what’s most valuable across your coastline, whilst enhancing marine habitats and biodiversity.

Durable low-carbon defence to shield coastal communities and infrastructure, while enhancing marine ecosystems

Shield your coast, build biodiversity

Protect valuable coastal structures and local communities with Intertidal reef cubes, hardy, low-carbon coastal defence structures that enhance biodiversity at your coastline.

Intertidal reef cubes dissipate wave energy and reduce risk of erosion, whilst working in harmony with the natural environment. Their marine-friendly materials and nature inclusive design mean they’re an ideal way to deliver biodiversity net gain for our habitats and ecosystems.

Units can be stacked, tessellated or scattered randomly, making them deal for partial or full replacement of rock armour, breakwaters, seawalls and stepped or sloping revetments.

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Why choose Intertidal reef cubes?

Science-backed design

Helping to boost the biodiversity along your coastline

Scalable, modular solution

Intertidal reef cubes are available no matter the size or scale of your project

Can be fit with existing structures

Can be incorporated into existing designs & structures – rewild shorelines whilst protecting assets.

Promotes human-nature interaction

Can be used as biodiversity enhancing walkways for piers, breakwaters, allowing closer human-nature interaction

Low CO2 emissions

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

Recycled and plastic-free

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

Alkali-activated material (AAM) binder

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

Modular scalable design

Modular and stackable allowing for structures of any size and scale

Find out more | Intertidal reef cube product sheet

Looking for more information on Intertidal 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 Intertidal reef cubes I can order?



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



How does the process of buying Intertidal reef cubes work?



How can Intertidal 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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