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Yellow-Ridged Ceratosoma (Ceratosoma flavicostatum) nudibranch, head on view, Komodo National Park, Indonesia.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Kofah (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

Portrait of an American saltwater crocodile on the surface of a mangrove at sunset with mouth wide open, Jardines De La Reina, Cuba.

Enormous whale shark (Rhincodon typus) in clear blue water with sunrays, Christmas Island, Australia.

Head-on portrait of purple anthias (Pseudanthias tuka) in black water, Manado, North Sulawesi, Indonesia.

Pair of pink skunk clownfish (Amphiprion perideraion) nestled in a round bright orange anemone, Manado, North Sulawesi, Indonesia.

Bumphead parrotfish (Bolbometopon muricatum) swimming over the Liberty Wreck in Tulamben, Bali, Indonesia.

American saltwater crocodile (Crocodylus acutus) in mangrove with mouth open showing teeth, Jardines De La Reina, Cuba.

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.

Pair of Chromodoris annae nudibranch with brilliant blue and yellow skirt, crawling over green and pink coral, Anilao, Batangas, Philippines.

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.

Detail of the green speckled eye of a juvenile porcupinefish, Lembeh Strait, North Sulawesi, Indonesia.

Green sea turtle (Chelonia mydas) on a ledge with a red gorgonian sea fan, North Sulawesi, Indonesia.

During the preparation for an ice dive, a chainsaw is working its way through the ice. This picture is from the underside of the ice in a flooded limestone quarry in Karlstrup, Denmark.

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.

A snorkeler approaches a hawksbill sea turtle (Eretmochelys imbricata), feeding on fisherman scraps in the sand, Curacao.

Young adult bull southern elephant seal (Mirounga leonina) holding young pup's head underwater trying to kill it, South Georgia Island, Southern Ocean

Young adult bull southern elephant seal (Mirounga leonina) holding young pup's head underwater trying to kill it, South Georgia Island, Southern Ocean

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