Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

A myriad of hard and soft corals 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 compete for space on the substrate of Darwin's Wall, Palau, Micronesia, Pacific

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Soft corals and sponges underwater on Long Caye in the Mesoamerican Barrier Reef, Belize

A myriad of hard and soft corals 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

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.

Ascidian, Didemnum molle, oscule detail, Dauin, Negros, Philippines.

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

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

Aerial view, Kuredu with water bungalows and beaches, Laviyani Atoll, Maldives, Indian Ocean, Asia

Aerial view, Kuredu with water bungalows and beaches, Laviyani Atoll, Maldives, Indian Ocean, Asia

Helicopter view, Six Senses Kanuhura Island Resort, with beaches and water bungalows, Lhaviyani Atoll, Maldives, Indian Ocean, Asia

Aerial view, Kudadoo Island resort with beaches and water bungalows, Lhaviyani Atoll, Maldives, Indian Ocean, Asia

Aerial view, Kudadoo Island resort with beaches and water bungalows, Lhaviyani Atoll, Maldives, Indian Ocean, Asia

Aerial view, Kuredu with water bungalows and beaches, Laviyani Atoll, Maldives, Indian Ocean, Asia

Aerial view, Asia, Indian Ocean, Maldives, Lhaviyani Atoll, Six Senses Kanuhura Island Resort, with beaches and water bungalows, Asia

Bullethead parrotfish (Chlorurus sordidus), Marsa Shona reef dive site, Egypt, Red Sea, Africa

Aerial view, Kudadoo Island resort with beaches and water bungalows, Lhaviyani Atoll, Maldives, Indian Ocean, Asia

Aerial view, Kudadoo Island resort with beaches and water bungalows, Lhaviyani Atoll, Maldives, Indian Ocean, Asia

Helikopteransicht, Six Senses Kanuhura Island Resort, mit Straenden und Wasserbungalows, Lhaviyani Atoll, Malediven, Indischer Ozean

Aerial view of the ocean floor, Heart Reef, heart-shaped reef, Great Barrier Reef World Heritage Area, Great Barrier Reef, UNESCO World Heritage Site, Queensland, South Pacific, Australia

Humphead wrasse (Cheilinus undulatus), Daedalus reef dive site, Egypt, Red Sea, Africa

Two divers swimming along the remaining structure of a shipwreck.

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Werck. Lockheed L-1011 TriStar three-engine plane intentionally sunk in 2019. In addition to being a great attraction for divers, these sunken structures;generally ships, but also planes, military vehicles...) become artificial reefs helping in the repopulation of the underwater bottoms. This wreck is located in the Red Sea, at a depth of between 18 and 31 meters. Aqaba, Jordan.

Werck. Lockheed L-1011 TriStar three-engine plane intentionally sunk in 2019. In addition to being a great attraction for divers, these sunken structures;generally ships, but also planes, military vehicles...) become artificial reefs helping in the repopulation of the underwater bottoms. This wreck is located in the Red Sea, at a depth of between 18 and 31 meters. Aqaba, Jordan.