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"Heavy snowfalls at the beginning of winter, followed by intense cold snaps, allow heavy crusts of ice layers to gradually build on the pine and birch," says Frozen Planet researcher Fredi Devas.

Just your typical work day as a Frozen Planet camerawoman. [Justine Evans abseils into a moulin, a gigantic crack in the ice down which meltwater tumbles on the Greenland Ice Sheet.]

Every year thousands of belugas migrate to Cunningham Inlet from hundreds of miles away to have a body scrub in the shallows.