In 2012, Tamara Lunger sighted the summit of K2 at an altitude of 8611 metres: for the moment it was still too high for her. The view of the summit can in itself instil fear, and not just because K2 is one of the most dangerous eight-thousanders, where more than eighty climbers have tragically lost their lives. Despite this, two years later, the twenty-eight year old decided to return to Pakistan and together with the climber Nikolaus Gruber took on the most important challenge in her climbing career: to arrive at the top of K2 without oxygen.