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Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae) flukes-up dive in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), flukes-up dive at sunset in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

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

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

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

Adult great skua (Stercorarius skua) being dive-bombed by defensive arctic terns (Sterna paradisaea) guarding their nest sites in the Svalbard Archipelago, Norway

Snorkelers on the surface of a blue hole. Virgin Blue Hole dive site, Palau, Micronesia, Pacific Ocean. More info: Blue holes such as this are submerged limestone sink holes.

Adult great skua (Stercorarius skua) being dive-bombed by defensive arctic terns (Sterna paradisaea) guarding their nest sites in the Svalbard Archipelago, Norway

Swimming at Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

Gran Cenote de Tulum in Yucatan Peninsula, Quintana Roo, Mexico. There are thousands of cenotes dotted all over Mexico���s Yucatan Peninsula, and their existence is as much a defining characteristic of the region as is the distinct geological feature from which they result. Once revered by the ancient Mayans as sacred wells, they are now magnets for tourists, adventurers, and explorers alike.

Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

Aerial view of Kittiwake shipwreck artificial reef dive site, Grand Cayman, Cayman Islands, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba diver on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Scuba diver watching Giant starfish (Linckia columbia) on rock overgrown with algae, Cabo Marshall, Galapagos archipelago, Unesco World Nature Preserve, Ecuador, South America, Pacific

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Green turtle (Chelonia mydas) with ship holder (Remora remora), dive site House Reef, Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

Hemprich's tree coral (Dendronephthya hemprichi) and backlit diver, Fury Shoals reef dive site, Red Sea, Egypt, Africa

Atlantic goliath grouper (Epinephelus itajara) with open mouth at cleaning station. Dive site John Pennekamp Coral Reef State Park, Key Largo, Florida Keys, Florida, USA, North America

Portrait of lizardfish (Synodus saurus) with pointed teeth. Dive site El Cabron Marine Reserve, Arinaga, Gran Canaria, Spain, Atlantic Ocean, Europe

Caribbean reef shark (Carcharhinus perezii), John Pennekamp Coral Reef State Park dive site, Key Largo, Florida Keys, Florida, USA, North America

Brown moray eel, masked moray eel (Gymnothorax unicolor) with blue eye hiding in a rock formation under water. Dive site Pasito Blanco Reef, Arguineguin, Gran Canaria, Spain, Atlantic Ocean, Europe

Well camouflaged fish with sharp teeth, lizardfish (Synodus saurus), on the sandy seabed. Dive site El Cabron Marine Reserve, Arinaga, Gran Canaria, Spain, Atlantic Ocean, Europe

Diver with a large shoal of Black Striped Salema (Xenocys jessiae), Cousin Rock, UNESCO World Heritage Site, Galapagos archipelago, Ecuador, Pacific Ocean

Yellow-edged moray (Gymnothorax flavimarginatus) at cleaning station with pacific cleaner shrimp (Lysmata amboinensis), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

Gray angelfish (Pomacanthus arcuatus), Nursery dive site, Tavernier, Florida Keys, Florida, USA, North America

Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

Giant electric ray (Narcine entemedor), electric, dangerous, and scuba diver, Cabo Marshall, Galapagos archipelago, Unesco World Nature Preserve, Ecuador, South America, Pacific

Green turtle (Chelonia mydas), dive site John Pennekamp Coral Reef State Park, Key Largo, Florida Keys, Florida, USA, North America

A group of fish eating an common jellyfish (Aurelia aurita), Amber Jack dive site, Destin, Panhandle, Gulf of Mexico, Florida, USA, North America

Large blue octopus (Octopus cyaneus) among stony corals. Dive site Erg Fougani, Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

Red knot coral (Acabaria biserialis) in the backlight, on a steep wall. Dive site St Johns Reef, Saint Johns, Red Sea, Egypt, Africa

Golden-tailed moray eel (Gymnothorax miliaris), Salemera dive site, La Palma, Canary Islands, Spain, Atlantic Ocean, Europe

Common cuttlefish (Sepia officinalis), El Cabron marine reserve dive site, Arinaga, Gran Canaria, Spain, Atlantic Ocean, Europe

Marbled snake eel (Callechelys marmorata), buried in the sand. Dive site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

A round-tailed manatee (Trichechus manatus) suckles her young, Crystal River dive site, Florida, USA, North America

Group, shoal of european barracuda (Sphyraena sphyraena) near Hyeres. Dive site Giens Peninsula, Cote dAzur, France, Europe

Diver with a large shoal of Black Striped Salema (Xenocys jessiae), Cousin Rock, UNESCO World Heritage Site, Galapagos archipelago, Ecuador, Pacific Ocean

Giant sea fan (Annella mollis) on steep wall, St Johns Reef dive site, Saint Johns, Red Sea, Egypt, Africa

Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

Emperor Angelfish (Pomacanthus imperator), Dive Site House Reef, Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

An common lionfish (Pterois miles) lurks for prey, on sea goldie (Pseudanthias squamipinnis), Marsa Shuna reef dive site, Red Sea, Egypt, Africa

Diver swimming in cave, underwater, light rays, sun rays, Shaab Claudia reef dive site, Red Sea, Egypt, Africa

Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

Hemprich's tree coral (Dendronephthya hemprichi) and backlit diver, Fury Shoals reef dive site, Red Sea, Egypt, Africa

Button Star Coral (Favia favus), Dive Site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

Hawksbill turtle (Eretmochelys imbricata imbricata), John Pennekamp Coral Reef State Park dive site, Key Largo, Florida Keys, Florida, USA, North America

Close-up of giant moray (Gymnothorax javanicus) with cleaner fish, Abu Fendera reef dive site, Egypt, Red Sea, Africa

Portrait of star puffer (Arothron stellatus), Dive Site Wreck of the Thistlegorm, Sinai, Egypt, Red Sea, Africa

Raspberry coral (Pocillopora damicornis) in the backlight. Dive site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

Round-tailed manatee (Trichechus manatus) grazing, Crystal River dive site, Florida, USA, North America

Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

Green turtle (Chelonia mydas) with 2 ship keepers (Remora remora), dive site House Reef Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

Giant Moray (Gymnothorax javanicus) moray under broccoli tree (Litophyton arboreum), dive site House Reef Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

Pharaoh antler coral (Acropora pharaonis), Panorama Reef dive site, Hurghada, Egypt, Red Sea, Africa

Humphead wrasse (Cheilinus undulatus), Small Brother dive site, Brother Islands, Egypt, Red Sea, Africa

Pair of red sea clownfish (Amphiprion bicinctus) in the evening light, sun rays, dive site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

Hawksbill sea turtle (Eretmochelys imbricata), House reef dive site, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

A red sea clownfish (Amphiprion bicinctus) in its splendour anemone (Heteractis magnifica), Daedalus Reef dive site, Egypt, Red Sea, Africa

Whip coral dwarf goby (Bryaninops yongei), dwarf goby, dive site Strait of Tiran, Sinai, Egypt, Red Sea, Africa

Green turtle (Chelonia mydas), Nursery dive site, Tavernier, Florida Keys, Florida, USA, North America

Hemprichs tree coral (Dendronephthya hemprichi), red, on steep wall. Dive site Small Brother, Brother Islands, Egypt, Red Sea, Africa

Sand tiger shark (Carcharias taurus) in its den. Dive site Protea Banks, Margate, KwaZulu Natal, South Africa, Africa

Mauve stinger (Pelagia noctiluca), in the Mediterranean Sea near Hyeres. Dive site Giens Peninsula, Cote dAzur, France, Europe