1387-1452 - A large bull shark (Carcharhinus leucas) at The Bistro dive site in Fiji.

1387-1451 - Silvertip shark (Carcharhinus albimarginatus) at The Bistro Dive site in Fiji.

1387-1450 - Scuba diver and silvertip shark (Carcharhinus albimarginatus) at The Bistro Dive site in Fiji.

1387-1449 - Silvertip shark (Carcharhinus albimarginatus) at The Bistro Dive site in Fiji.

1387-1448 - A large bull shark (Carcharhinus leucas) at The Bistro dive site in Fiji.

1387-1447 - A large bull shark (Carcharhinus leucas) at The Bistro dive site in Fiji.

1387-1446 - A large tawny nurse shark (Nebrius ferrugineus) swims past divers at The Bistro dive site in Fiji.

1387-1445 - A large bull shark (Carcharhinus leucas) at The Bistro dive site in Fiji.

1387-1444 - A large bull shark (Carcharhinus leucas) at The Bistro dive site in Fiji.

1112-11517 - Soft corals and sponges underwater on Long Caye in the Mesoamerican Barrier Reef, Belize

1112-11449 - Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

1112-11436 - Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

1112-11426 - Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

832-405665 - Green turtle (Chelonia mydas) with ship holder (Remora remora), dive site House Reef, Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

832-405664 - Hemprich's tree coral (Dendronephthya hemprichi) and backlit diver, Fury Shoals reef dive site, Red Sea, Egypt, Africa

1112-10152 - A myriad of hard and soft corals at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

1112-10108 - 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

832-404955 - Portrait of lizardfish (Synodus saurus) with pointed teeth. Dive site El Cabron Marine Reserve, Arinaga, Gran Canaria, Spain, Atlantic Ocean, Europe

832-404954 - 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

832-404953 - 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

860-292681 - Mauve stinger (Pelagia noctiluca), Poisson Lune dive site, le Dramont. Var. France.

860-292682 - Mauve stinger (Pelagia noctiluca), Poisson Lune dive site, le Dramont. Var. France.

860-292573 - Loggerhead turtle (Caretta caretta), Menjangan dive site, Garden Eel, Bali, Indonesia.

1116-53344 - Divers moving through a kelp forest in Sooke Bay off the coast of Vancouver Island in the Pacific Ocean, Vancouver Island, British Columbia, Canada

1116-53341 - 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

1116-53167 - Snorkeling in Shark Alley and Hol Chan Marine Reserve, Ambergris Cay, Belize

1116-53168 - Young woman snorkeling with a school of fish, Water Cay, Utila, Honduras

1116-53166 - Young snorkeler dives toward coral in the Buccoo Reef and Nylon Pool, Tobago, Tobago, Republic of Trinidad and Tobago

1116-53165 - Split View of a teenage girl snorkeling in a bikini with a tour boat on the surface of the water above, Country of Aruba

1116-53163 - Teenage girl snorkeling in a yellow bikini, Country of Aruba

1116-53160 - Lone snorkeler floats in waters off a palm tree-dotted island in the Tobago Cays, near Bequia, Saint Vincent and the Grenadines, West Indies

860-291932 - Pair of Chinese Sea Snakes (Laticauda semifasciata) swimming, Snake Ridge dive site, Gunung Api, Banda Sea, Indonesia

860-291931 - Fish trap basket, Boardroom dive site, Pura Island, near Alor, Banda Sea, Indonesia

860-291921 - Juvenile Taylor's Inflator Filefish (Brachaluteres taylori), Jadi-Jadi dive site, Lembeh Straits, Sulawesi, Indonesia

860-291920 - Clark's Anemonefish (Amphiprion clarkii), Makawide Slope dive site, Lembeh Straits, Sulawesi, Indonesia

860-291918 - Bedford's Flatworm (Pseudobiceros bedfordi) free-swimming, Circus dive site, Bunaken, Manado, Sulawesi, Indonesia

860-291899 - False Clown Anemonefish (Amphiprion ocellaris) in Magnificent Sea Anemone (Heteractis magnifica), Tiga Batu dive site, Bangka Island, north Sulawesi, Indonesia, Pacific Ocean

832-401958 - Red knot coral (Acabaria biserialis) in the backlight, on a steep wall. Dive site St Johns Reef, Saint Johns, Red Sea, Egypt, Africa

832-401957 - Giant sea fan (Annella mollis) on steep wall, St Johns Reef dive site, Saint Johns, Red Sea, Egypt, Africa

832-401956 - Diver swimming in cave, underwater, light rays, sun rays, Shaab Claudia reef dive site, Red Sea, Egypt, Africa

832-401955 - Hemprich's tree coral (Dendronephthya hemprichi) and backlit diver, Fury Shoals reef dive site, Red Sea, Egypt, Africa

832-401953 - Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

832-401954 - Pacific hawksbill turtle (Eretmochelys imbricata bissa), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

832-401952 - Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

832-401951 - Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

860-291788 - Red Snapper (Lutjanus bohar) in interior of wreck with Emperor Angelfish (Pomacanthus imperator), Jepun Wreck dive site, Candidasa, Bali, Indonesia

860-291787 - Day Octopus (Octopus cyanea), Biaha dive site, Candidasa, Bali, Indonesia

860-291641 - Poison Ocellate Octopus (Octopus mototi) on blue fabric, TK3 dive site, Lembeh Straits, Sulawesi, Indonesia

860-291586 - Clark's Anemonefish (Amphiprion clarkii) in Magnificent Sea Anemone (Heteractis magnifica), Laha dive site, Ambon, Maluku, Indonesia, Banda Sea

832-401074 - Close-up of giant moray (Gymnothorax javanicus) with cleaner fish, Abu Fendera reef dive site, Egypt, Red Sea, Africa

832-401073 - Giant Moray (Gymnothorax javanicus) moray under broccoli tree (Litophyton arboreum), dive site House Reef Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

832-401072 - Mountain coral (Porites lutea), Daedalus Reef dive site, Egypt, Red Sea, Africa

832-401071 - A round-tailed manatee (Trichechus manatus) suckles her young, Crystal River dive site, Florida, USA, North America

832-401070 - Round-tailed manatee (Trichechus manatus) grazing, Crystal River dive site, Florida, USA, North America

832-401069 - Round-tailed manatee (Trichechus manatus), Crystal River dive site, Florida, USA, North America

832-401068 - Round-tailed manatee (Trichechus manatus), Crystal River dive site, Florida, USA, North America

832-401066 - Gray angelfish (Pomacanthus arcuatus), Nursery dive site, Tavernier, Florida Keys, Florida, USA, North America

832-401067 - Green turtle (Chelonia mydas), Nursery dive site, Tavernier, Florida Keys, Florida, USA, North America

832-401065 - Hawksbill turtle (Eretmochelys imbricata imbricata), John Pennekamp Coral Reef State Park dive site, Key Largo, Florida Keys, Florida, USA, North America

832-401064 - Green turtle (Chelonia mydas) with 2 ship keepers (Remora remora), dive site House Reef Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

832-401063 - Large blue octopus (Octopus cyaneus) among stony corals. Dive site Erg Fougani, Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

832-401062 - Hawksbill sea turtle (Eretmochelys imbricata), Erg Monica dive site, El Quesir, Red Sea, Egypt, Africa

832-401060 - Group, shoal of european barracuda (Sphyraena sphyraena) near Hyeres. Dive site Giens Peninsula, Cote dAzur, France, Europe

832-401061 - Mauve stinger (Pelagia noctiluca), in the Mediterranean Sea near Hyeres. Dive site Giens Peninsula, Cote dAzur, France, Europe

832-401059 - Whip coral dwarf goby (Bryaninops yongei), dwarf goby, dive site Strait of Tiran, Sinai, Egypt, Red Sea, Africa

832-401058 - An common lionfish (Pterois miles) lurks for prey, on sea goldie (Pseudanthias squamipinnis), Marsa Shuna reef dive site, Red Sea, Egypt, Africa

832-401057 - Emperor Angelfish (Pomacanthus imperator), Dive Site House Reef, Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

832-401056 - Raspberry coral (Pocillopora damicornis) in the backlight. Dive site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

832-401055 - Green turtle (Chelonia mydas), Ras Mohammed National Park dive site, Sinai, Egypt, Red Sea, Africa

832-401054 - 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

832-401053 - Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

832-401049 - 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

832-401048 - A group of fish eating an common jellyfish (Aurelia aurita), Amber Jack dive site, Destin, Panhandle, Gulf of Mexico, Florida, USA, North America

832-401047 - Caribbean reef shark (Carcharhinus perezii), John Pennekamp Coral Reef State Park dive site, Key Largo, Florida Keys, Florida, USA, North America

832-401046 - Green turtle (Chelonia mydas), dive site John Pennekamp Coral Reef State Park, Key Largo, Florida Keys, Florida, USA, North America

832-401045 - Pineapple sea cucumber (Telenota ananas), Erg Monica dive site, El Quesir, Red Sea, Egypt, Africa

832-401044 - A red sea clownfish (Amphiprion bicinctus) in its splendour anemone (Heteractis magnifica), Daedalus Reef dive site, Egypt, Red Sea, Africa

832-401043 - 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

832-401042 - Humphead wrasse (Cheilinus undulatus), Small Brother dive site, Brother Islands, Egypt, Red Sea, Africa

832-401040 - Bullethead parrotfish (Chlorurus sordidus), Marsa Shona reef dive site, Egypt, Red Sea, Africa

832-401041 - Marbled snake eel (Callechelys marmorata), buried in the sand. Dive site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

832-401039 - Button Star Coral (Favia favus), Dive Site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

832-399955 - Turkey moray (Gymnothorax meleagris) with open mouth, Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

832-399956 - Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

832-399957 - Peacock mantis shrimp (Odontodactylus scyllarus), Sodwana Bay National Park dive site, Maputaland Marine Reserve, KwaZulu Natal, South Africa, Africa

832-399958 - Common cuttlefish (Sepia officinalis), El Cabron marine reserve dive site, Arinaga, Gran Canaria, Spain, Atlantic Ocean, Europe

832-399959 - Golden-tailed moray eel (Gymnothorax miliaris), Salemera dive site, La Palma, Canary Islands, Spain, Atlantic Ocean, Europe

832-399961 - Sand tiger shark (Carcharias taurus) in its den. Dive site Protea Banks, Margate, KwaZulu Natal, South Africa, Africa

832-399960 - Red Sea Dwarf Wrasse (Paracheilinus octotaenia), Dive Site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

832-399962 - Portrait of star puffer (Arothron stellatus), Dive Site Wreck of the Thistlegorm, Sinai, Egypt, Red Sea, Africa

832-399426 - Pharaoh antler coral (Acropora pharaonis), Panorama Reef dive site, Hurghada, Egypt, Red Sea, Africa

832-399424 - Royal angelfish (Pygoplites diacanthus) in the red reef. Dive site Daedalus Reef, Egypt, Red Sea, Africa

832-399425 - Pharaoh antler coral (Acropora pharaonis), House Reef dive site, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

832-399423 - Humphead wrasse (Cheilinus undulatus), Daedalus reef dive site, Egypt, Red Sea, Africa

832-399422 - Hemprichs tree coral (Dendronephthya hemprichi), red, on steep wall. Dive site Small Brother, Brother Islands, Egypt, Red Sea, Africa

832-399010 - Hawksbill sea turtle (Eretmochelys imbricata), House reef dive site, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

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