Winter comes to Longyearbyen, meaning 24 hours of total darkness and extreme Arctic weather. Witness the aftermath of an unthinkable tragedy, when an avalanche claims the life of the local teacher and a young child during a brutal storm.

Watch Christine put her new dog sledding skills to the test by entering the Hilmar Nois wilderness dog race. Meanwhile, Mary Ann makes a misstep when she hires a new chef, and tour guide Mats is less than thrilled about large polar bear tracks.

After the Arctic's warmest winter ever recorded, the residents of Svalbard are witnessing the effects. Professor Chris's students measure a glacier, Alex takes a tour to a Russian mining settlement, and Lara spends a day cleaning up after 200 dogs.