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California sea lion (Zalophus californianus), with snorkeler at Los Islotes, Baja California Sur, Mexico, North America

California sea lion (Zalophus californianus), with photographer at Los Islotes, Baja California Sur, Mexico, North America

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

California sea lion (Zalophus californianus), with photographer at Los Islotes, Baja California Sur, Mexico, North America

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

California sea lion (Zalophus californianus), with snorkeler at Los Islotes, Baja California Sur, Mexico, North America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult gentoo penguin (Pygoscelis papua), porpoising for swimming speed near the Antarctic Peninsula, Southern Ocean, Polar Regions

Galapagos fur seal (Arctocephalus galapagoensis) hauled out on lava flow in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Haenyeo women, famous for diving into their eighties and holding their breath for up to two minutes, free-diving for seafood and crustaceans, Jeju Island, South Korea, Asia

Haenyeo women, famous for diving into their eighties and holding their breath for up to two minutes, free-diving for seafood and crustaceans, Jeju Island, South Korea, Asia

Moon jellyfish (Aurelia aurita), Aquarium of San Sebastian, Bay of Biscay, province of Gipuzkoa, Basque Country, Spain, Europe

The shell of a green sea turtle (Chelonia mydas) swimming to the surface, Saint Croix, U.S. Virgin Islands.

A giant oceanic manta ray (Mobula birostris) with attached remoras at San Benedicto island in Mexico.

A hawksbill sea turtle (Eretmochelys imbricata) feeds on sponge and an angelfish follows for scraps in Cozumel, Mexico.

A diver shines a light in on a cavern filled with glassy sweepers (Pempheris schomburgkii) at Molasses Reef in Key Largo, Florida.

A diver has a close encounter with an oceanic whitetip shark (Carcharhinus longimanus) at Cat Island in the Bahamas.

World champion free diver and his team in training shot from inside a sunken barge 90 feet below in Bimini, Bahamas.

A pair of manatees swimming in formation with the lead manatee in the crystal clear freshwater of the Fanning Springs inlet to the Suwannee River, Florida.

A school of Bluegill and Sunfish appear to swim toward the light from above over the Morrison Springs cavern dropoff at the state park in northwest Florida.

A Sheepshead looks on as a pair of Blue Angelfish appear to be confused on which direction to go but each are feeding on different parts of coral and algae covered jetty rocks at St. Andrew Bay channel wall in Panama City Beach, Florida.

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 scuba diver surfacing and looking up into the light as he ascends from the bottom of Devil's Den, a sinkhole in Williston, Florda.

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

A Crocodilefish lies motionless on the sandy bottom at night in Papua New Guinea employing camouflauge while laying in wait for an unsuspecting fish.

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 Peninsula Cooter turtle (Pseudemys peninsularis) looking up and positioned on the sandy bottom of the Morrison Springs cavern at 80 feet deep in the fresh clearwaters of the State Park near Red Bay, Florida.

An adult American Eel (Anguilla rostrata) prowls along the edge of the Morrison Springs cavern at 85 feet deep watching over the adolescent eels in the clear freshwaters of the state park near Red Bay, Florida.

Golden Damselfish (Amblyglyphidodon aureus) and other schooling fish swim around the coral head topped with Elkhorn Coral in the South Pacific ocean near Tavarua Island offshore from Liti Levu, Fiji.

A Blackside Hawkfish (Paracirrhites forsteri) swims over the red tentacles of a sea fan in the warm clear waters off the coast of 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.

A Spotfin Lionfish flares it's dorsel spines and fins to display threat while laying on a colorful reef at night in the warm clear waters of Papua New Guinea. Lionfish float fearlessly around the reef as they are also one of the most venomous residents there.

Pink Anemonefish (Amphiprion perideraion) appear to be on lookout to protect their purple anemone home in the clear and warm ocean waters of Papua New Guinea.