83-13395 - Ferry boats moored on the central bay of this coral fringed holiday and scuba dive destination, Bunaken Island, North Sulawesi, Indonesia, Southeast Asia, Asia

1116-52810 - Family enjoying swimming in a natural pool under a plunging waterfall along the Road to Hana, Maui, Hawaii, United States of America

1350-6630 - 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.

1350-6633 - 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.

1350-6628 - 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.

1350-6611 - Underwater close up view of open coral polyp during a dive, Cancun, Quintana Roo, Mexico

1350-6656 - Snorkeling in the beach, Corn Island, Caribbean Sea, Nicaragua, Central America, America. Local man with a starfish.

1350-5282 - Young woman swims underwater in the beautiful waters of Menorca, Spain

1350-5360 - Young woman dives into swimming pool

1350-5387 - Young woman swims underwater in the beautiful waters of Menorca, Spain

1350-5355 - Young woman swims underwater in the beautiful waters of Menorca, Spain

1116-51219 - 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

1116-51218 - 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

1116-51217 - 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

1116-51892 - Hawaiian Green sea turtle (Chelonia mydas) swimming over the coral on the sea floor; Maui, Hawaii, United States of America

1116-51884 - 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

1116-51891 - Hawaiian Green sea turtle (Chelonia mydas) swimming close to the surface with sunburst; Maui, Hawaii, United States of America

1116-51222 - 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

1116-52196 - 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

1116-51214 - Saber Squirrelfish (Sargocentrum spiniferum) at the backwall of Molokini Crater; Molokini Crater, Maui, Hawaii, United States of America

1116-51220 - 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

1116-52114 - 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

1116-51885 - Close-up of the orange colored plumes of a Christmas tree worm (Spirobranchus giganteus) attached to coral; Maui, Hawaii, United States of America

1116-51890 - Close-up detail of a crown of thorns starfish (Acanthaster planci); Maui, Hawaii, United States of America

1116-52197 - 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

1116-51215 - 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

1350-2344 - French angelfish, Pomacanthus paru, Ilha rata, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil (S. Atlantic)

1350-2571 - Hawaiian reef lobster, endemic, Enoplometopus occidentalis, Portlock, Oahu, Hawaii (N. Pacific)

1350-2479 - Juvenile blue triggerfish, Pseudobalistes fuscus, Rongelap, Marshall Islands, Micronesia

1350-2578 - Feather stars, Oxycomanthus bennetti, Temple of Doom, Great Barrier Reef, Australia (S. Pacific).

1350-2485 - Live sharksucker, Echeneis naucrates, Rongelap, Marshall Islands, Micronesia

1350-2483 - Parrotfish, Scarus sp., sleeping between Acropora coral plates, Rongelap, Marshall Islands, Micronesia

1350-2487 - Thorny oyster, Spondylus varius, Rongelap, Marshall Islands, Micronesia

1350-2573 - Pennant butterflyfish, juvenile, schooling Heniochus diphreutes, Portlock, Oahu, Hawaii (N. Pacific).

1350-2534 - Starry night octopus, Octopus luteus, foraging on coral reef at night, Malapascua, Cebu, Philippines, Visayan Sea.

1350-2471 - Wave breaking over shallow coral reef, Ailuk atoll, Marshall Islands, Pacific

1350-2429 - Galapagos sharks, Carcharhinus galapagensis, Oahu, Hawaii

1350-2482 - Saddled butterflyfish, Chaetodon ephippium, Rongelap, night, Marshall Islands, Micronesia

1350-2316 - Crab preying on dead portuguese man-of-war, Physalia physalis, Praia do Forte, Bahia, Brazil (South Atlantic)

1350-2315 - Porco's bay and Dois Irmaos islands, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil (S. Atlantic)

1350-2201 - Island of Taha'a, French Polynesia. A tourist girl do dive at the Motu Mahana, Taha'a, Society Islands, French Polynesia, South Pacific.

1350-2181 - Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

1350-2244 - 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.

1350-2182 - Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

1350-2195 - Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

1350-2183 - Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

1350-2197 - Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

1350-2184 - 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.

1350-2247 - Sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

1350-2246 - 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.

1350-2200 - Tropical paradise seascape Taha'a island landscape, French Polynesia. Motu Mahana palm trees at the beach, Taha'a, Society Islands, French Polynesia, South Pacific.

1350-2245 - Sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

1350-2129 - An outrigger boat used for reef excursions in Bora Bora, French Polynesia Society Island.

1116-49672 - A research diver from the MOC Marine Institute glues broken coral back together at Molokini Marine Preserve off the island of Maui, Hawaii. The coral is tagged and will be monitored, Maui, Hawaii, United States of America

1116-49729 - Young woman in red bikini snorkels over coral reef, Molokini, Hawaii, United States of America

1116-49671 - Research divers from the MOC Marine Institute 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

1116-49714 - This larval stage of a long arm octopus, Octopus sp. is no more that five inches across (as pictured) and was photographed at night in midwater several miles off the Kona Coast during a blackwater dive, Island of Hawaii, Hawaii, United States of America

1116-49711 - An aerial view of 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

1116-49670 - Wire coral goby (Bryaninops yongei) on wire coral (Cirrhipathes sp.), a relative of black coral.

1116-49673 - 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

1116-49667 - A photographer lines up with a camera in a housing to shoot a large red soft coral fan, Indonesia

1116-49669 - Divers exploring the prop and rudder at the stern of The Carthaginian, a Lahaina landmark, that was sunk as an artificial reef off Lahaina, Maui, Hawaii in December 2005, Maui, Hawaii, United States of America

1116-49713 - A split scene with a shallow hard coral reef below water and island above with the live aboard dive vessel Infiniti, Philippines

1116-49712 - 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

1116-49668 - A photographer lines up with a SLR in a housing with a macro lens to shoot at tiny crab perched on soft coral, Indonesia

1116-49677 - Divers explore a drop off covered with sponges and gorgonian and alcyonarian coral, Philippines

1116-49658 - Split view with a coral reef below the water's surface and palm trees covering the island above, Fiji

1116-49730 - Three young people free diving over a Hawaiian reef, Hawaii, United States of America

1116-49707 - Aerial view of Mokuho’oniki Islet and Kanaha Rock near the island of Molokai, Maui County, Hawaii, United States of America

1116-49717 - The Mantis shrimp (Odontodactylus scyllarus) is also known as a clown mantis shrimp and peacock mantis shrimp, Cebu, Philippines

1116-49666 - 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

1116-49732 - The Backwall at Molokini Marine Preserve drops down to 300 feet. Various reef fish stick close to a crevice here, Molokini, Maui, Hawaii, United States of America

1116-49731 - A young couple free diving in clear water over a Hawaiian reef, Hawaii, United States of America

1116-48272 - 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

1116-48269 - Scuba divers at Joe's Wall Dive Site, Belize Barrier Reef, Belize

1116-48275 - Scuba diver in the East Wall dive site, Belize Barrier Reef, Belize

1116-48273 - 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

1116-47554 - Scuba diver obscured by bubbles underwater at the dive site Blue Channel, Roatan Marine Park, Bay Islands Department, Honduras

1116-47553 - Scuba diver underwater at the dive site Cemetery Wall, South side of Roatan Island, Bay Islands Department, Honduras

1116-48274 - Scuba diver at Joe's Wall Dive Site, Belize Barrier Reef, Belize

1116-47552 - Scuba divers in Roatan Marine Park, West End Wall dive site, Roatan, Honduras

1116-48270 - Scuba diver at Three Amigos Dive Site, Belize Barrier Reef, Belize

1116-46821 - Divers pictured hanging at 15 feet for a decompression stop before surfacing. The diver in the lead has released a safety float to mark their position to boats above, Maui, Hawaii, United States of America

1116-41494 - 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

1116-41502 - A snorkeler dives on a healthy hard coral reef near Two Tree Island off Kadavu Island in the southeast corner of Fiji, Fiji

1116-41499 - Two women free diving at Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

1116-41500 - Two men free diving over a Hawaiian hard coral reef with slate pencil sea urchins (Heterocentrotus mammillatus), Hawaii, United States of America

1116-41399 - 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

832-380148 - Man jumps into a swimming pool, Munduk, Bali, Indonesia, Asia

1116-39988 - Scuba diver looking at bright Butterflyfish (Chaetodontidae), Lanai City, Lanai, Hawaii, United States of America

1116-40088 - Male diver with sun over ocean surface, Island of Hawaii, Hawaii, United States of America

832-354870 - Hamilton Island, Whitsunday Islands, Great Barrier Reef, Queensland

832-354871 - Hamilton Island, Whitsunday Islands, Great Barrier Reef, Queensland

1113-19984 - West Indies, Bonaire, sunset, pier, diver near Captain Don s Habitat, diving resort

797-10060 - Ireland, North, Belfast, Titanic Quarter, Visitor centre designed by Civic Arts & Eric R Kuhne, with statue of diving woman in foreground.

979-457 - Pacific humpback whale adult,Megaptera novaeangliae, fluke-up dive in the Au Au Channel near Maui, Hawaii

979-470 - Adult humpback whale fluke-up dive in Frederick Sound, southeast Alaska, USA.

979-469 - Adult humpback whale fluke-up dive in Frederick Sound, southeast Alaska, USA.

817-224210 - Cliff diver, a clavadista, diving off the cliffs at La Quebrada, Acapulco, Guerrero State, Mexico

817-224211 - Cliff diver, a clavadista, diving off the cliffs at La Quebrada, Acapulco, Guerrero State, Mexico