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Scuba diver on her underwater propulsion vehicle getting a close-up look at an upside-down jellyfish, Bonaire, Caribbean Netherlands.

1 cm yellow tube polyp captured at 4.5x life size with what appears to be a small macroscopic Isopod feeding on it, Bonaire, Caribbean Netherlands.

A large group of purple tube sponge sits high on the reef, Bonaire, Caribbean Netherlands.The Hilma Hooker Shipwreck is visible in the background.

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

The hawksbill sea turtle (Eretmochelys imbricata) swims in the waters off the coast of Bonaire, Caribbean Netherlands. The hawksbill is a critically endangered sea turtle belonging to the family Cheloniidae.

The hawksbill sea turtle (Eretmochelys imbricata) swims in the waters off the coast of Bonaire, Caribbean Netherlands. The hawksbill is a critically endangered sea turtle belonging to the family Cheloniidae.

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

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, feeding on soft coral, side view, South Ari Atoll, Maldives.

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, frontal view, South Ari Atoll, Maldives.

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, frontal view, South Ari Atoll, Maldives.

Head on view showing cerata on an aeolid nudibranch, Pteraeolidia ianthina, in Komodo National Park, Indonesia.

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

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

Close-up view of a green turtle (Chelonia mydas) resting on a reef top in Komodo National Park, Indonesia.

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

A Red Sail Junk in Hong Kong Harbour, Hong Kong, Special Administrative Region of the People's Republic of China, China, Asia

June 2006 - Ejection of lava during nighttime Strombolian eruption of Stromboli volcano, Aeolian Islands, Mediterranian Sea, Italy.

Large school of dozens of scalloped hammerhead shark converging towards the surface, silhouetted against the blue water, Cocos Island.

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

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

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

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

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

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