Looking out from the bridge of the Norwegian polar research vessel Kronprins Haakon (see main image), dense pack ice extends into the darkness in every direction. To the east, a narrow strip of purple paints the midday sky just above the horizon.
It’s the first sign of daylight here in three months. Research ships rarely venture into this region – 1,000km (621 miles) north of the Arctic Circle, in the Greenland Sea – during polar night.
Temperatures fall below -30°C (-22°F)…
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