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Adult brown pelicans (Pelecanus occidentalis), plunge diving for fish, Isla Carmen, Baja California Sur, Mexico, North America

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

Ferry boats moored on the central bay of this coral fringed holiday and scuba dive destination, Bunaken Island, North Sulawesi, Indonesia, Southeast Asia, Asia

Pacific humpback whale adult,Megaptera novaeangliae, fluke-up dive in the Au Au Channel near Maui, Hawaii

Crab preying on dead portuguese man-of-war, Physalia physalis, Praia do Forte, Bahia, Brazil (South Atlantic)

Sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Albatros. Tourists on a snorkeling excursion to view black tipped sharks and sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Tourists on a snorkeling excursion to view black tipped sharks and sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Island of Taha'a, French Polynesia. A tourist girl do dive at the Motu Mahana, Taha'a, Society Islands, French Polynesia, South Pacific.

Starry night octopus, Octopus luteus, foraging on coral reef at night, Malapascua, Cebu, Philippines, Visayan Sea.

French angelfish, Pomacanthus paru, Ilha rata, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil (S. Atlantic)

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.

Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

Porco's bay and Dois Irmaos islands, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil (S. Atlantic)

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.

Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

Pennant butterflyfish, juvenile, schooling Heniochus diphreutes, Portlock, Oahu, Hawaii (N. Pacific).

A waiter serves cocktails in Taha'a island resort, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

Snorkeling in the beach, Corn Island, Caribbean Sea, Nicaragua, Central America, America. Local man with a starfish.

Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

Parrotfish, Scarus sp., sleeping between Acropora coral plates, Rongelap, Marshall Islands, Micronesia

Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

Young snorkeler dives toward coral in the Buccoo Reef and Nylon Pool, Tobago, Tobago, Republic of Trinidad and Tobago

Scuba divers in the Great Blue Hole dive site on the Belize Barrier Reef. This site was made famous by Jacques Cousteau, who declared it one of the top five scuba diving sites in the world, Belize

Scuba diver obscured by bubbles underwater at the dive site Blue Channel, Roatan Marine Park, Bay Islands Department, Honduras

Scuba divers in the Great Blue Hole dive site on the Belize Barrier Reef. This site was made famous by Jacques Cousteau, who declared it one of the top five scuba diving sites in the world, Belize

Close-up detail of a crown of thorns starfish (Acanthaster planci); Maui, Hawaii, United States of America

Close-up of the orange colored plumes of a Christmas tree worm (Spirobranchus giganteus) attached to coral; Maui, Hawaii, United States of America

A group of travelers stop for an early morning swim in the ocean after camping in their van on a road trip; Podgora, Split-Dalmatia County (Splitsko-dalmatinska zupanija), Croatia

A chain of salps (Salpa sp.) that was photographed under water during a blackwater dive off the Kona coast, the Big Island; Island of Hawaii, Hawaii, United States of America

Saber Squirrelfish (Sargocentrum spiniferum) at the backwall of Molokini Crater; Molokini Crater, Maui, Hawaii, United States of America

The Blue Pools of Makarora offer enticing blue waters to swim in. A man jumps off a bridge into the water in Mount Aspiring National Park; Makarora, New Zealand

A Red-Spot Comb Jelly (Eurhamphaea vexilligera) passes by during a blackwater dive off the Kona coast, the Big Island; Island of Hawaii, Hawaii, United States of America

Hawaiian Green sea turtle (Chelonia mydas) swimming close to the surface with sunburst; Maui, Hawaii, United States of America

Close-up of a blue goatfish (Parupeneus cyclostomus) showing the two barbels tucked under the chin, used to probe and detect prey; Maui, Hawaii, United States of America

Hawaiian Green sea turtle (Chelonia mydas) swimming over the coral on the sea floor; Maui, Hawaii, United States of America

Ridgeback Slipper Lobster (Scyllarides haanii) hiding in its lair between lava rocks on Molokini Crater's backwall offshore of Maui; Molokini Crater, Maui, Hawaii, United States of America

A tentaculate ctenophore, also known as comb jelly or sea gooseberry (Pleurobrachia sp.), opens its mouth to ingest zooplankton prey during a blackwater dive off the Kona coast, the Big island; Island of Hawaii, Hawaii, United States of America

A pair of salps (Salpa sp.) with hyperiid amphipod (Hyperiidea) hitchhikers that were photographed under water during a blackwater dive off the Kona Coast, the Big Island; Island of Hawaii, Hawaii, United States of America

Split View of a teenage girl snorkeling in a bikini with a tour boat on the surface of the water above, Country of Aruba

Divers moving through a kelp forest in Sooke Bay off the coast of Vancouver Island in the Pacific Ocean, Vancouver Island, British Columbia, Canada

Family enjoying swimming in a natural pool under a plunging waterfall along the Road to Hana, Maui, Hawaii, United States of America

Lone snorkeler floats in waters off a palm tree-dotted island in the Tobago Cays, near Bequia, Saint Vincent and the Grenadines, West Indies

Scuba divers swim through Pennant Butterflyfish (Heniochus diphreutes) feeding on zooplankton off the backwall of Molokini Crater near Maui Island; Molokini Crater, Maui, Hawaii, United States of America

Close-up of a photographer scuba diving and looking at the camera for a self-portrait while submerged in ocean water and kelp floating behind, Vancouver Island, British Columbia, Canada

The Blue Pools of Makarora offer enticing blue waters to swim in. A man jumps off a bridge into the water in Mount Aspiring National Park; Makarora, New Zealand

Scuba diver underwater at the dive site Cemetery Wall, South side of Roatan Island, Bay Islands Department, Honduras

Two men free diving over a Hawaiian hard coral reef with slate pencil sea urchins (Heterocentrotus mammillatus), Hawaii, United States of America

A snorkeler dives on a healthy hard coral reef near Two Tree Island off Kadavu Island in the southeast corner of Fiji, Fiji

Two women free diving at Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

Scuba diver looking at bright Butterflyfish (Chaetodontidae), Lanai City, Lanai, Hawaii, United States of America

This green sea turtle (Chelonia mydas), an endangered species, is passing under Lone Tree Arch, a dive site on the Kona Coast, Kona, Island of Hawaii, Hawaii, United States of America

Slate pencil sea urchins (Heterocentrotus mammillatus) colour the hard coral in this Hawaiian reef scene with three free divers, Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

The Malabar grouper (Epinephelus malabaricus) is one of the largest and most common cod found on coastal reefs. It can weight over 300 lbs and reach 4 feet in length, Fiji

Aerial view of Mokuho’oniki Islet and Kanaha Rock near the island of Molokai, Maui County, Hawaii, United States of America

A photographer lines up with a SLR in a housing with a macro lens to shoot at tiny crab perched on soft coral, Indonesia

An aerial view of the live aboard vessel Infiniti for scuba diving off Balicasag Island, a tiny island in South West Bohol in the central Philippines. It is famous for scuba diving on the deep, vertical walls and there are some fantastic hard coral gardens at snorkeling depths, Balicasag Island, Philippines

A split scene with a shallow hard coral reef below water and island above with the live aboard dive vessel Infiniti, Philippines

Research divers from the MOC Marine Institute glue broken coral heads back together and map out coral damage at Molokini Marine Preserve off the island of Maui, Hawaii. In the future, data from here will help to determine the health of Hawaii's reefs, Maui, Hawaii, United States of America