Story : The second appointment of the Ushuaia documentary series is with the spectacular images of Siberia: the land of ice, with its extreme nature. We will discover the customs of the nomadic populations who live in the North, and an extraordinary underwater world, rich in vegetation, in the depths of Lake Baikal. The secrets of the samurai swords: the Katana, symbol of the physical power and spiritual discipline of the Japanese warriors. Alberto Angela shows us exclusively, with the images of Michelangelo Pepe, the phases of the manufacturing of a sword, in the workshop of a blacksmith, who forges the weapon according to ancient tradition. The touching story of a former alcoholic, in the report by Marco Visalberghi. Alcoholism increasingly affects women and the path to overcome addiction is long and painful. Doctors and scientists study the damage caused by alcoholism and the possible therapies to defeat this often underestimated disease.