In Australia, Reef Design Lab is mixing concrete with oyster shells to create Erosion Mitigation Units that also provide marine life a habitat.
Digital modeling analysis and traditional casting methods were used to form organic shapes with favorable habitat conditions. The oyster shells create a welcoming surface for shellfish, while tunnels in the EMUs encourage coral growth and give fish, octopi, and crustaceans a place to evade predators.
The EMUs are already being used as a permeable offshore barrier at Port Philip Bay. The concept is being considered for a sustainable design award by design publication dezeen.