Israeli scientists are building a giant concrete reef to lure divers and snorkellers to the Red Sea without endangering one of the worldâs most diverse coral communities. Thousands of divers and snorkellers flock there but intensive diving is damaging the reef. Nadav Shashar, a marine ecologist at Israelâs Ben Gurion University told Reuters. âWhat we are trying to do is give an alternative option. Go and see the artificial habitat – if you damage it we can replace it.â Hulking blocks of concrete might not appeal to divers used to weaving between wild, multi-coloured plant life but after a few months in the water the reef has attracted more than 20 species of fish.