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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.

Pink anemonefish (Amphiprion perideraion) guard their anemone on a coral reef in the South Pacific ocean near Tavarua Island off the coast of Veti Levu, 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.

Schooling scalefin anthias fish (Pseudanthias squamipinnis) and beautiful soft corals of Beqa Lagoon, Fiji.

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.

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, feeding on soft coral, side view, South Ari Atoll, Maldives.

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, frontal view, South Ari Atoll, Maldives.

Three giant oceanic manta rays (Mobula birostris) circling at a cleaning station, South Ari Atoll, Maldives.

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, frontal view, South Ari Atoll, Maldives.

Whale shark swimming under a boat, with sharp sunrays cutting through the water, Cenderawasih Bay, West Papua, Indonesia.

Whale shark coming up from the depths under the boat, mouth wide open, with sharp sunrays cutting through the water.

A large whale shark under a bagan, siphoning water from the surface, with sunrays shining in the water, Cenderawasih Bay, West Papua, Indonesia.

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

An oceanic blacktip shark swims by with remora in tow, Aliwal Shoal, Umkomaas, KwaZulu-Natal, South Africa.

A pair of oceanic blacktip sharks with remora in tow pass each other by in a cloud of silvery fish, Aliwal Shoal, Umkomaas, KwaZulu-Natal, South Africa.

A sea lion, Zalophus Californianus, holds a sea star in its mouth, Sea of Cortez, Los Islotes, Mexico.

Waterfall pouring down a rocky cliff, with blurred motion, resulting from a slow shutter speed; at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, Europe

Waterfall pouring down a rocky cliff, with blurred motion, resulting from a slow shutter speed; at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, 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

View of vintage tram and colourful buildings in the Alfama District on a sunny day, Lisbon, Portugal, Europe

View of Lisbon Castle and Santa Justa Lift from Carmo Archaeological Museum during golden hour, Lisbon, Portugal, Europe

Snowy Egret (Egretta thula) starting flight, Sanibel Island, J.N. Ding Darling National Wildlife Refuge Florida, USA

Snowy Egret (Egretta thula) in flight, Sanibel Island, J.N. Ding Darling National Wildlife Refuge Florida, USA

Scenic view of the River Avon on a sunny day, Stratford-upon-Avon, Warwickshire, England, United Kingdom

Distant view of the Seljalandsfoss waterfall with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern Iceland, Iceland, Polar Regions

Distant view of the Seljalandsfoss waterfall with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern Iceland, Iceland, Polar Regions

Male broad-billed hummingbird (Cynanthus latirostris) in flight, Madera Canyon, Coronado National Forest, Arizona, United States of America, North America