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Scientist free diving to make a photo identification of an individual manta ray (Manta birostris), Yum Balam Marine Protected Area, Quintana Roo, Mexico, North America

Diver swimming underwater along the wall at Sipadan Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Diver swimming underwater with Bigeye trevally (Caranx sexfasciatus) (jacks) at Sipadan Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Silhouette of two scuba divers above Table coral, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Spotted eagle ray (Aetobatus narinari) underwater, Leon Dormido Island, San Cristobal Island, Galapagos Islands, Ecuador, South America

Spotted eagle ray (Aetobatus narinari) underwater, Leon Dormido Island, San Cristobal Island, Galapagos Islands, Ecuador, South America

Blacktip reef sharks (Carcharhinus melanopterus) cruising near tourists at Stingray City, Moorea, Society Islands, French Polynesia, South Pacific, Pacific

Giant stingray (Dasyatis spp), being fed by local guide in the shallow waters of Stingray City, Society Islands, French Polynesia, South Pacific, Pacific

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Whale shark (Rhincodon typus) with rainbow runner observed by a tourist and guide in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typu ) in Honda Bay, Puerto Princesa, Palawan, The Philippines, Southeast Asia, Asia

Tourist swimming with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourist swimming with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourist snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourist and tour guide swimming with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourist snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller with a juvenile whale shark (Rhincodon typus) feeding on the suface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller swimming with a juvenile whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller with oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

A group of snorkellers observing spinetail devil rays (Mobula mobular) engaged in sexual courtship in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkellers observing spinetail devil rays (Mobula mobular) engaged in sexual courtship in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkellers with an oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Underwater view of a scuba diver entering the water, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Silhouette of two scuba divers above coral reef scene, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Two tourists snorkelling with a whale shark (Rhincodon typus), in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Snorkellers with a juvenile whale shark (Rhincodon typus) feeding at the suface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Giant stingray (Dasyatis spp) cruising with tourists in the shallow waters of Stingray City, Society Islands, French Polynesia, South Pacific, Pacific

St. Francis Bridge, Caltagirone, Val di Noto, UNESCO World Heritage Site, Catania, Sicily, Italy, Mediterranean, Europe

Giant stingray (Dasyatis spp), being fed by local guide in the shallow waters of Stingray City, Society Islands, French Polynesia, South Pacific, Pacific

Coral encrusted biosphere in the marine reserve at Gangga Island, Sulawesi, Indonesia, Southeast Asia, Asia

Silhouette of three scuba divers above giant sea fan (Annella mollis), Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Diver inside the wreck of the Lesleen M freighter, sunk as an artificial reef in 1985 in Anse Cochon Bay, St. Lucia, West Indies, Caribbean, Central America

Two scuba divers descending down a line, part silhouette, low angle view, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Silhouette of two scuba divers above coral reef, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Coral encrusted biosphere in the marine reserve at Gangga Island, Sulawesi, Indonesia, Southeast Asia, Asia

Silhouette of three scuba divers above coral reef, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Man scuba diving while exploring the coral reefs of Bonaire, Netherlands Antilles, Caribbean, Central America

Couple scuba diving while exploring the coral reefs of Bonaire, Netherlands Antilles, Caribbean, Central America

Bangka (boat) over coral, Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia

Split view of female tourist snorkelling underwater and landscape of St. Pierre Island coral reef, Seychelles, Indian Ocean, Africa

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

A Japanese Jake seaplane, shot down during World War II, lies on the seafloor of Palau's lagoon. Many planes and dozens of large ships were sunk around Palau during the war.

A Japanese Jake seaplane, shot down during World War II, lies on the seafloor of Palau's lagoon. Many planes and dozens of large ships were sunk around Palau during the war.

Reef-building corals thrive in shallow water in Raja Ampat, Indonesia. This remote region is known for its beautiful reefs and spectacular marine biodiversity.

Corals grow on a shallow reef in Indonesia. This beautiful, tropical region is known for its spectacular reefs and high marine biodiversity.

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

Young adult bull southern elephant seal (Mirounga leonina) close up while swimming in glacier run off, South Georgia Island, Polar Regions

Views of the wreck of the Guvernoren, a 20th century whale processing ship, in the Enterprise Islands, Antarctica, Polar Regions

Glacial iceberg detail from ice calved off the LeConte Glacier, Southeast Alaska, Pacific Ocean, United States of America, North America