i'm on nearby summer island to join the island's dive master, arjan sierink. hi! good to meet you! and this is what i've come to see — the world's largest 3d printed reef. it was made in australia by reef—design labs using a ceramic material, and then shipped in small sections to be constructed underwater. took a little while for corals to get used to the material. they grow slower than the corals. but the corals are very, very strong. a living reef is the most effective natural defence barrier for protecting the islands from erosion. 3d printing allows for rapid testing of new designs to find the best structure for growing corals. the team behind this is looking to use similar techniques to create other reefs in other parts of the world. as for summer island, this is one of the many different shapes arjan�*s experimenting with. and it's incredible how quickly the wildlife has claimed it as its home. his recreated coral oasis was literally swimming with fish species. we're still pioneering, and there are many, many islands, many projects all over the world, to find out how we can m