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An adult white-spotted hermit crab (Dardanus megistos), encountered on a night dive on Arborek Reef, Raja Ampat, Indonesia, Southeast Asia, Asia

Full moon at Murex Bangka Dive Resort, Bangka Island, near Manado Sulawesi, Indonesia, Southeast Asia, Asia

Adult humpback whale (Megaptera novaeangliae), flukes-up dive near Morris Reef, Southeast Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Wilhelmina Bay, Antarctica, Polar Regions

Ornate church by a beach on Manadotua Island off the holiday dive island of Bunaken, Manadotua, Bunaken, North Sulawesi, Indonesia, Southeast Asia, Asia

Full moon at Murex Bangka Dive Resort, Bangka Island, near Manado, Sulawesi, Indonesia, Southeast Asia, Asia

Full moon at Murex Bangka Dive Resort, Bangka Island, near Manado, Sulawesi, Indonesia, Southeast Asia, Asia

Full moon at Murex Bangka Dive Resort, Bangka Island, near Manado Sulawesi, Indonesia, Southeast Asia, Asia

The live-aboard dive boat Amphoria, Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

Adult gray whale (Eschrichtius robustus), flukes-up dive in Magdalena Bay on the Baja Peninsula, Baja California Sur, Mexico, North America

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Wilhelmina Bay, Antarctica, Polar Regions

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Wilhelmina Bay, Antarctica, Polar Regions

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Wilhelmina Bay, Antarctica, Polar Regions

An adult humpback whale (Megaptera novaeangliae), flukes-up dive in Dallmann Bay, Antarctica, Polar Regions

An adult humpback whale (Megaptera novaeangliae), flukes up dive in Monterey Bay Marine Sanctuary, California, United States of America, North America

An adult humpback whale (Megaptera novaeangliae), flukes up dive in Monterey Bay Marine Sanctuary, California, United States of America, North America

Man preparing to dive at Chankanaab Park, famous for its superb coral reef, on the island of Cozumel, off the Yucatan Peninsula, Mexico, North America

Dive boat with mainland and Manadotua Island beyond, off this coral fringed holiday and scuba island. Bunaken, North Sulawesi, Indonesia, Southeast Asia, Asia

Free diver gets ready to explore the underwater landscape floating down Olho D'Agua and Prata rivers, Bonito, Mato Grosso do Sul, Brazil, South America

Guests from the Lindblad Expedition ship National Geographic Explorer take the Polar Plunge off ice floe in the Weddell Sea, Antarctica, Southern Ocean

Guests from the Lindblad Expedition ship National Geographic Explorer take the Polar Plunge off ice floe in the Weddell Sea, Antarctica, Southern Ocean

Guests from the Lindblad Expedition ship National Geographic Explorer taking the "polar plunge" in the Svalbard Archipelago, Norway

Guests from the Lindblad Expedition ship National Geographic Explorer taking the "polar plunge" in the Svalbard Archipelago, Norway

Free diver gets ready to explore the underwater landscape floating down Olho D'Agua and Prata rivers, Bonito, Mato Grosso do Sul, Brazil, South America

Guests from the Lindblad Expedition ship National Geographic Explorer taking the "polar plunge" in the Svalbard Archipelago, Norway

Underwater photographer explores the underwater landscape floating down Olho D'Agua River, Bonito, Mato Grosso do Sul, Brazil, South America

Guests from the Lindblad Expedition ship National Geographic Explorer take the Polar Plunge off ice floe in the Weddell Sea, Antarctica, Southern Ocean

Guests from the Lindblad Expedition ship National Geographic Explorer take the Polar Plunge off ice floe in the Weddell Sea, Antarctica, Southern Ocean

Olive ridley turtle hatchling, Lepidochelys olivacea, Costa do Sauipe, Bahia, Brazil (South Atlantic)

Crab preying on dead portuguese man-of-war, Physalia physalis, Praia do Forte, Bahia, Brazil (South Atlantic)

Parrotfish sleeping, Sparisoma sp., head detail, Ponta da Sapata, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil (S. Atlantic)

Olive ridley turtle hatchling, Lepidochelys olivacea, Costa do Sauipe, Bahia, Brazil (South Atlantic)

Porco's bay and Dois Irmaos islands, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil (S. Atlantic)

Sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Snorkeling excursion in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Albatros. Tourists on a snorkeling excursion to view black tipped sharks and sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Snorkeling excursion in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Tourists on a snorkeling excursion to view black tipped sharks and sting rays in the shallow waters of the Bora Bora lagoon, Moorea, French Polynesia, Society Islands, South Pacific. Cook's Bay.

Island of Taha'a, French Polynesia. A tourist girl do dive at the Motu Mahana, Taha'a, Society Islands, French Polynesia, South Pacific.

Painted frogfish, Antennarius pictus, white phase, Sabang wreck, Puerto Galera, Mindoro, Philippines.

Electric eel, Electrophorus electricus; this air-breathing freshwater fish can deliver an electric shock up to 650 volts and naturally occurs in the Amazon river basins of South America including Brazil and Guyanas; photo taken in captivity.

Feather star on sea fan, and scalefin anthias, Pseudanthias squamipinnis, Kilima steps, Puerto Galera, Mindoro, Philippines.

Nudibranch, Jorunna funebris, feeding on blue sponge, Haliclona sp., Monkey beach, Puerto Galera, Mindoro, Philippines.

Stripe-leg spiny lobster, Panulirus femoristriga, eye and rostrum detail, Short drop-off, Palau, Micronesia.

Pink anemonefish, Amphiprion perideraion, in sea anemone, Great barrier reef marine park, Australia (South Pacific).

Snowflake moray eel, Echidna nebulosa, scavenging in seagrass beds, Dumaguete, Negros, Philippines, Visayan sea.

Starry night octopus, Octopus luteus, foraging on coral reef at night, Malapascua, Cebu, Philippines, Visayan Sea.

Common lionfish, Pterois volitans, blends in with a variety of soft corals and sponges, Cars, Dumaguete, Negros Island, Philippines.

Juvenile striped catfish, Plotosus lineatus, schooling and feeding on sandy bottom, Puerto Galera, Mindoro, Philippines.

Thousands of scalefin anthias, Pseudanthias squamipinnis, hover over corals and barrel sponge, Puerto Galera, Mindoro, Philippines.

Short-tailed pipefish, Trachyrhamphus bicoarctatus, Masaplod, Dumaguete, Negros Island, Philippines..

Family of false clown anemone fish, Amphiprion ocellaris, seeking refuge in sea anemone, Dumaguete, Negros Island, Philippines.

Thorny oyster, Spondylus varius, resting on coral reef at night, Dumaguete, Negros Island, Philippines.

Emperor shrimp, Periclimenes imperator, next to gills of spanish dancer, Hexabranchus sanguineus, night, Puerto Galera, Mindoro, Philippines.

Family of false clown anemone fish, Amphiprion ocellaris, seeking refuge in sea anemone, Masaplod, Dumaguete, Negros Island, Philippines.

Over under image of coral reef, Acropora spp., and trees at Majikin Island, Namu atoll, Marshall Islands (N. Pacific).

Pair of wire coral gobies, Bryaninops yongei, on wire coral, Cirripathes anguina,Ailuk atoll, Marshall Islands, Pacific

Juvenile and adult pink anemonefish in sea anemone, Amphiprion perideraion, Fila Reef, Port Vila, Vanuatu (S. Pacific).

Over under image of coral reef, Acropora spp., and trees at Majikin Island, Namu atoll, Marshall Islands (N. Pacific).

Orange-finned anemonefish, Amphiprion chrysopterus, and Merten's sea anemone, Stichodactyla mertensii, Namu atoll, Marshall Islands (N. Pacific).