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Guadalupe fur seals (Arctocephalus townsendi), underwater on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A diver around a Stylophora species hard coral, on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives. Indian Ocean, Asia

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

Diver with Anthias fish swimming around hard coral, Laguna Reef, Straits of Tiran, Red Sea, Egypt, North Africa, Africa

Diver with Anthias fish swimming around hard coral, Gordon Reef, Straits of Tiran, Red Sea, Egypt, North Africa, Africa

Man preparing to dive at Chankanaab Park, famous for its superb coral reef, on the island of Cozumel, off the Yucatan Peninsula, Mexico, North America

Diver and hard and soft coral reef and lyre tail anthias (Pseudanthias squamipinnis), Marsa Alam, Egypt, Red Sea, North Africa, Africa

Diver and hard and soft coral reef and lyre tail anthias (Pseudanthias squamipinnis), Marsa Alam, Egypt, Red Sea, North Africa, Africa

Two scuba divers, giant moray (Gymnothorax javanicus) with open mouth, and coral reef, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

High angle view of a scuba diver diving in shallow water close to coral reef, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Close encounters with Nurse shark on G Spot Reef, Turks and Caicos, West Indies, Caribbean, Central America

Diver enjoying the tube sponges on a wall dive in the Turks and Caicos, West Indies, Caribbean, Central America

Close encounters with Nurse shark on G Spot Reef, Turks and Caicos, West Indies, Caribbean, Central America

Diver enjoys watching a grouper hiding in the coral heads in Turks and Caicos, West Indies, Caribbean, Central America

Green turtle cruising the reef with diver, Turks and Caicos, West Indies, Caribbean, Central America

Close encounters with Nurse shark on G Spot Reef, Turks and Caicos, West Indies, Caribbean, Central America

Close encounters with Nurse shark on G Spot Reef, Turks and Caicos, West Indies, Caribbean, Central America

Divers play with and film Nurse sharks (Ginglymostoma cirratum) and a Goliath grouper (Epinephelus itajara), Molasses Reef, Key Largo, Florida, United States of America, North America

Diver explores the reef wall covered with orange cup coral (Tubastrea sp.), Coconut point, Apo island Marine Reserve, Philippines, Southeast Asia, Asia

Goliath grouper (Epinephelus itajara) next to video camera, Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) and diver, Molasses Reef, Key Largo, Florida, United States of America, North America

A multitude of sponges, tunicates, feather stars, sea stars, soft and hard corals as well as fish co-exist harmoniously in the reefs at Cogon, Apo Island marine reserve, Philippines, Visayan sea, Southeast Asia, Asia

Scuba diver handles nurse shark (Ginglymostoma cirratum) while being filmed, Molasses Reef, Key Largo, Florida, United States of America, North America

Scuba divers observe nurse sharks (Ginglymostoma cirratum), Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) and diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Tourists snorkelling from a dive and snorkel platform anchored to the Great Barrier Reef off Cairns in Queensland, Australia, Pacific

Great barracuda (Sphyraena barracuda) and diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Yellow-saddle Goatfish (Parupeneus cyclostomus), large school of yellow fish swimming over tropical coral reef and Scuba Diver, Red Sea.

Cup coral colony (Tubastrea micrantha) A diver looks down on a large cup coral colony. Komodo, Indonesia, Pacific Ocean.

Soft coral colony (Dendronephthya sp.) and Golden sweeper fish (Parapriacanthus ransonneti) Komodo, Indonesia, Pacific Ocean.

Diver looks down on blue seastar (Linkia laevigata) on a barrel sponge (Xestospongia sp.) Komodo, Indonesia, Pacific Ocean.

Diver looks at diverse coral reef including a green cup coral colony (Tubastrea micrantha) Komodo, Indonesia, Pacific Ocean.

Jourdan's turban (turbo jourdani) large gastropod shell, reddish-brown, Rottnest Island reef, wild, day, marine protected area, free-diving off, cool temperate waters of Western Australia. MORE INFO: Marine plant common kelp, a dominant feature of the underwater landscape. Protected areas are covered in lush growth of diverse algae, also red algea are here.

western king wrasse (coris auricularis), male, dark pink colour with reddish-brown band running around boby and blue-green colouration over the head, wild, day, marine protected area, diving off Rottnest Island, reef edges, sand, seagrass, Western Australia, Indian Ocean. MORE INFO: social structure where dominant male, usually the biggest in the area, will have a harem of females. When the male dies or is absent for any length of time the largest female will change sex and dominate the group.

tallfin batfish (platax teira), juvenile, wild, day, marine protected area, diving off Coral Bay, Ningaloo reef, Western Australia, Indian Ocean. MORE INFO: with 3 dark bars, very long dorsal, anal and pelvic fins, feed on plankton from water column.

bengal sergeant (abudefduf bengalensis) wild, day, marine protected area, diving off Coral Bay, Ningaloo reef, Western Australia, Indian Ocean. MORE INFO: has rounded, white-edged tail lobes.

footballer sweep (neatypus obliquus) diagonal yellow bands are edged in black and stand out against the silvery-blue body, wild, day, marine protected area, reef, in small schools diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name stripey, eating green algae as they sweep over the reef.

Goliath grouper (Epinephelus itajara) and shark diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) and Nurse sharks approach a diver from behind, Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) observed by diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Divers play with and film Nurse sharks (Ginglymostoma cirratum) and a Goliath grouper (Epinephelus itajara), Molasses Reef, Key Largo, Florida, United States of America, North America

Survey divers on ascent over coral reef, mainly Acropora palifera, Namu atoll, Marshall Islands, Pacific

Goliath grouper (Epinephelus itajara) and diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Diver explores the reef wall covered with orange cup coral (Tubastrea sp.), Coconut point, Apo island Marine Reserve, Philippines, Southeast Asia, Asia

Scuba diver handles nurse sharks (Ginglymostoma cirratum), Molasses Reef, Key Largo, Florida, United States of America, North America

Split image of pristine coral reef, surveyor and island, Rongelap, Marshall Islands, Micronesia, Pacific

Diver splits legs apart for passing goliath grouper (Epinephelus itajara), Molasses Reef, Key Largo, Florida, United States of America, North America

Scuba diver handles nurse shark (Ginglymostoma cirratum), Molasses Reef, Key Largo, Florida, United States of America, North America

Technical Divers using Trimix, Rebreathers and technical diving equipment, Divetech, Grand Cayman, Cayman Islands, Caribbean

Snorkeller observes diverse coral reef, Rock Islands, Palau, Caroline Islands, Micronesia, Pacific Ocean, Pacific