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A young married couple celebrate their ten year anniversary by scuba diving in the clear freshwaters of Devil's Den Springs, a sinkhole in Williston, Florida, as the afternoon sun filters down into the cavern.

A scuba diver swims through an underwater field of tape grass leading away from the Blue Springs cave in Merritts Mill Pond in Marianna, Florida.

A technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.

A scuba diver ascends into the light emanating above through the sink hole into the clear freshwaters of Devil's Den cave near Williston, Florida.

A Whitetip Reef Shark laying on the bottom in the sand and looking up at the above approaching photographer in the clear South Pacific ocean off Likuri Island, Fiji.

A Black Sea Turtle (Chelonia mydas agassizi) with a remora trying to attach, swims through a school of fish in the clear South Pacific ocean near Tavarua Island off the coast of Liti Levu, Fiji.

A Black Sea Turtle (Chelonia mydas agassizi) swims in the clear South Pacific ocean off the coast of Tavarua Island, Fiji in March 2012.

A West Indian Manatee surfacing in the shallow clear freshwaters of Fanning Springs, a state park in northeast Florida.

Wildebeests and zebras on the move at dusk across the dusty landscape of Amboseli National Park, Kenya, East Africa, Africa

Scuba diver navigates the waters using a diver propulsion vehicle off the coast of Bonaire, Caribbean Netherlands.

The hawksbill sea turtle (Eretmochelys imbricata) swims in the waters off the coast of Bonaire, Caribbean Netherlands. The hawksbill is a critically endangered sea turtle belonging to the family Cheloniidae.

The hawksbill sea turtle (Eretmochelys imbricata) swims in the waters off the coast of Bonaire, Caribbean Netherlands. The hawksbill is a critically endangered sea turtle belonging to the family Cheloniidae.

Scuba diver uses a diver propulsion vehicle to navigate the waters off the coast of Bonaire, Caribbean Netherlands.

Revellers in costumes and masks at a cemetery in Humahuaca during carnival in Jujuy province in the Andes region of Argentina

Large school of dozens of scalloped hammerhead shark converging towards the surface, silhouetted against the blue water, Cocos Island.

Enormous whale shark (Rhincodon typus) in clear blue water with sunrays, Christmas Island, Australia.

Head-on portrait of purple anthias (Pseudanthias tuka) in black water, Manado, North Sulawesi, Indonesia.

Pair of Caribbean reef sharks (Carcharhinus perezi) swimming along the reef, Jardines De La Reina, Cuba.

Underwater photographer at the entrance of a cave framed by pink barrel sponges, North Sulawesi, Indonesia.

Green sea turtle (Chelonia mydas) on a ledge with a red gorgonian sea fan, North Sulawesi, Indonesia.

Pink hairy squat lobster (Lauriea siagiani) inside a pink barrel sponge, Lembeh Strait, Bitung, North Sulawesi, Indonesia.

Oriental sweetlip and yellow snapper at cleaning statiuon with a cleaner wrasse, Ari and Male Atoll, Maldives.

Great white shark (Carcharodon carcharias) swims by divers in a shark cage, Isla Guadalupe, Baja California, Mexico. The divers are feeding the shark jack mackerel (Trachurus symmetricus).

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Reveller in costume and mask at Humahuaca carnival in Jujuy province in the Andes region of Argentina, South America

Pregnant female California sea lion (Zalophus californianus), on Los Islotes, Baja California Sur, Mexico, North America

Wildebeests and zebras on the move at dusk across the dusty landscape of Amboseli National Park, Kenya, East Africa, Africa

Climbers on the rocks with the snowy peaks of the Alps in the background, Stelvio Pass, Valtellina, Lombardy, Italy, Europe

Viking burial ground with stones placed in oval outline of a Viking ship, Lindholm Hoje, Aalborg, Jutland, Denmark, Scandinavia, Europe

An adult brown pelican (Pelecanus occidentalis) at night near Isla Santa Catalina, Baja California Sur, Mexico, North America

Adult male Xantus's hummingbird (Hylocharis xantusii), Todos Santos, Baja California Sur, Mexico, North America

An adult brown pelican (Pelecanus occidentalis) at night near Isla Santa Catalina, Baja California Sur, Mexico, North America

Common (blue) wildebeest (gnu), (Connochaetes taurinus), in rainstorm, Kgalagadi Transfrontier Park, South Africa, Africa