A large group of snorkelers drifting across the tropical coloured waters of the Great Barrier Reef Australia

scuba scuba diving diver snorkeling great barrier reef blue water tropical destination tropics global warming coral bleaching travel destination tourism tourist australia marine park marine reserve animal encounter adventure recreation pacific nature wildlife water activity ecosystem plastics floating swimming 4k resolution unique view different perspective sea bed lady elliot island queensland coral reef blue sky summer holiday deserted island drone view nature reserve seabirds infrastructure dive boat glass bottom boat school activity excursion camp teachers lessons