Reefy’s patented design is the first breakwater, the company claims, to both protect the coast and boost marine biodiversity. The huge blocks, made from low-carbon concrete, have a textured surface to attract oysters and mussels. Holes in the blocks let some water flow through since waves hitting a solid wall would bounce back and combine with incoming waves to become even more powerful. The crevasses also provide more habitat for breeding fish and other animals. The company is also testing a “reef paint” it designed with minerals like calcium to attract oysters to the surface of the structure.

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