Old conveyor belts, while they could be laid inside tailings dam walls to reduce dam wall failures, they can also be kirigami cut (like origami) into artificial reefs that promote seagrass and hence seabed stablisation, and at the same time creating new homes for prawns while generating blue carbon credits from the seagrass growth capture of carbon. The seagrass growth is promoted by solar powered horticultural LEDS together with underwater sensor and camera systems to ensure high performance of all aspects, from the seagrass growth to the prawn breeding, blue carbon capture and general monitoring of the seabed for other environmental threats.