>>NARRATOR: The Arctic Ocean is alive with sounds that include marine mammals and the movements of the sea ice. The sounds you hear were recorded by a hydrophone during the winter of 2011 to 2012. [SOUNDS OF ICE CREAKING AND GROANING] In winter, winds and currents move the Arctic sea ice with tremendous force and noise. Early explorers sailed their ships northward into the Arctic, where they were frozen into the ice, and drifted with the currents until spring thaw. The sounds you hear are the same as those reported by these early explorers. >>MALE VOICE: "...screeching and howling and whining which was absolutely hideous..." [SOUNDS OF ICE CRACKING] >>MALE VOICE: "...a rumble, a shriek, a groan, and a crash of a falling house all combined..." [SOUNDS OF ICE CRASHING] >>NARRATOR: The force of the ice movement is so strong that ships can inadvertently be caught, crushed, and sunk. A ship captain reported in 1855 that his ship was caught in the ice and within 10 minutes, disappeared beneath the surface, barely long enough for the crew to escape and save their boats. [SOUNDS OF ICE RUMBLING]