Scuba divers observation of two species of Sharks sleeping together in a reef crevice on the Great Barrier Reef

blind shark carpet shark great barrier reef scuba diver marine citizen science underwater ocean research scientist reef system coral reef marine research data collection study underwater research marine scientist ocean gbr scuba scuba diving diver tropical destination tropics marine park animal encounter fish nature wildlife water activity ecosystem creature animal behaviour colourful blue planet aquarium collector fish keeper unique 4k resolution underwater light sea creature behavior australia cairns queensland observation pacific symbiotic relationship