What does it take to photograph the arctic nature?

I traveled to a lot of countries and biotopes with my camera to photography wildlife and nature, but I like the cold arctic regions and especially the Svalbard best. This year I went there during a time when the day is returning after a four-month polar night. The first sun rays illuminate the frozen landscape, but warmer days are just a distant dream. What does it take shooting nature when daytime temperatures fall to 30 degrees Celsius below zero?

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