A diver films a Greenland shark beneath the Arctic ice.

"'It rose up and hovered near me in an almost vertical position...When I saw its mouth starting to open, I got concerned.' But there is no record of Greenland sharks ever attacking humans, and a nudge with a strobe light sent this one into retreat."

(Text from and photograph shot on assignment for, but not published in, "Greenland Sharks," September 1998, National Geographic magazine)