Tortue de mer (Chelonia mydas) plongeant à contre-jour, banc de poissons, réflexion interne totale, Grande barrière de corail, UNESCO, Patrimoine mondial, Queensland, Cairns, Australie, Pacifique | Green sea turtle (Chelonia mydas) decends in backlight of sun, fish school, total internal reflection, Great Barrier Reef, UNESCO, World Heritage Site, Queensland, Cairns, Australia, Pacific, Ocean