Limestone skeleton of the Klunzinger soft coral (Dendronephthya klunzingeri), Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Scuba diver with torch looking at a red Sea Fan (Plexauridae) at coral reef, Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific, Oceania

Scuba diver looking at red, unidentified coral sea fan on coral reef, steep wall, backlit, sun, Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific, Oceania

Scuba diver with torch looking at a Melithea Gorgonian Coral (Melithea sp. ) at coral reef, Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific, Oceania

Scuba diver watching a Manta Ray (Manta birostris) swimming above coral reef, Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific, Oceania

Graphic structure on underside of Red Pillow Starfish (Halithyle regularis), detail, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Detail of toxic Crown-of-thorns starfish (Acanthaster planci), spines, crown of thorns, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Scuba diver watching school of Fairy Basslets (Pseudanthias lori), at bushy Soft Coral (Siphonogorgia godeffroyi), Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific, Oceania

Scuba diver with torch watching school of Oriental Sweetlips (Plectorhinchus vittatus, Plectorhinchus orientalis) at coral reef, Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific, Oceania

Detail of Eye patch sea cucumber (Bohadschia argus), Pacific, Great Barrier Reef, Australia, Oceania

Pair of bannerfish (Heniochus acuminatus), Great Barrier Reef, Australia, Oceania

Aerial view Great Barrier Reef, Queensland, Australia, Oceania

Aerial view Great Barrier Reef, Queensland, Australia, Oceania

Aerial view Great Barrier Reef, Queensland, Australia, Oceania

Barramundi Cod (Cromileptes altivelis), Great Barrier Reef, Australia, Oceania

Barramundi Cod (Cromileptes altivelis), Great Barrier Reef, Australia, Oceania

Barramundi Cod (Cromileptes altivelis), Great Barrier Reef, Australia, Oceania

Barramundi Cod (Cromileptes altivelis), Great Barrier Reef, Australia, Oceania

Kuhl's stingray (Neotrygon kuhlii), Great Barrier Reef, Australia, Oceania

Watsons Bay Lizard Island, Great Barrier Reef, Australia, Oceania

Pink skunk clownfish (Amphiprion perideraion), Great Barrier Reef, Australia, Oceania

Leopard coral grouper (Plectropomus leopardus), Great Barrier Reef, Australia, Oceania

"Divers looking at a pair of Broadclub Cuttlefish (Sepia latimanus), UNESCO World Heritage Site, Great Barrier Reef, Australia, Pacific Ocean, Oceania"