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The Arctic recently made headlines after Donald Trump repeated his desire to buy Greenland. Trump cited national security interests, but for many the territory's vast mineral wealth is the main attraction. Yet economic development elsewhere in the vast polar region has ground to a halt.

Working conditions in the Arctic Ocean are extremely challenging at this time of the year for Norwegian fisherman Sondre Alnes-Bonesmo.

The sun last rose at the end of October, and it is not due to appear in the sky again until the middle of February.

In addition to the endless dark, temperatures can plummet below minus 40C, and storms can bring vast waves.