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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

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

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

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

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

The wreck of the MS Oliva on Nightingale Island, part of the Tristan da Cunha Group, South Atlantic Ocean

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

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.

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

An underwater photographer swims past a large yellow gorgonian fan with a bed of red soft corals beneath it, Fiji.

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

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

Diver looks on at sponges, coral and crinoids in a colorful Komodo seascape, taken at Cannibal Rock, Horseshoe Bay, Komodo National Park, Indonesia.

Diver looks on at sponges, pink soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

A trio of reef manta rays (Mobula alfredi) swimming above a reef top, Komodo National Park, Indonesia.

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

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.

Divers visit the wreck of the Pelicano which sits on the bottom of the Caribbean Sea near Playa Del Carmen, Mexico.

Two scuba divers in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

On the island of pearls of Mikimoto (named after the inventor and developer of the pearl culture: Kokichi Mikimoto 1858-1954), women divers in traditional clothing. Toba, Ise-Shima National Park, Japan

On the island of pearls of Mikimoto (named after the inventor and developer of the pearl culture: Kokichi Mikimoto 1858-1954), women divers in traditional clothing. Toba, Ise-Shima National Park, Japan

Humpback whale (Megaptera novaeangliae), mother and calf underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Kyphosus sectatrix seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Kyphosus sectatrix seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

The sergeant major or pintano fish(Abudefduf saxatilis) seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Nurse shark (Ginglymostoma cirratum) seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Stingray seen during Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Stingray seen during Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Shipwreck Restaurant Ruins at the entrance to the Pirate Canal, Bacalar Lagoon, Bacalar, Quintana Roo State, Mexico

A myriad of hard and soft corals compete for space on the substrate of the snorkel site known as the Milky Way, Palau, Micronesia, Pacific