Svalbard in the Arctic spends many months of the year in complete darkness, an unrelenting frozen winter with temperatures down to minus 40C. As this documentary reveals, when the sun finally reappears the landscape magically transforms from an ice world into a rich tundra full of exotic plants, birds, arctic foxes, polar bears, walrus and reindeer. This transformation is only possible thanks to some bizarre micro-organisms that feed on ice and the stunning abilities of migrating birds. Narrated by Domhnall Gleeson