This film takes us on a captivating journey around our planet Earth, along the polar circle. If north of the 66th parallel, the temperature can drop to minus 70°C, this has not prevented plants, animals and humans from finding lands where they can settle, each species deploying its own strategies to survive in these extreme regions... In Greenland, Alaska, Siberia, Iceland and the Lofoten Islands, there are vast expanses covered in ice, snow, tundra and rocks. Many researchers, fascinated by these territories, try to understand them better and reveal their secrets