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Greenland Shark Swim, Greenland, 1998

"Slow and spooky, an 11-foot [3.4-meter] shark cruises past a submerged ice ledge where seals often rest. Never before photographed beneath Arctic ice, the Greenland shark, whose scientific name, Somniosus microcephalus, means 'small-headed sleeper,' has eluded close study until now."

—From "Greenland Sharks," September 1998, National Geographic magazine

Photograph by Nick Caloyianis