World Oceans Day: Researchers transplant corals to the seabed off Fenjiezhou Island south of Hainan. Since 2004, scientists have been trying to revive the underwater world. Fenjiezhou is not far from the vacation hotspot of Sanya. Diving tourism and environmental pollution have taken their toll on the reefs. At least these activities seem to yield some small successes. A few sea creatures have already been attracted back.