The first person to summit all 14 eight-thousanders was Italian Reinhold Messner in 1986, who completed the feat without the aid of supplementary oxygen. In 2010, Basque Edurne Pasaban became the first woman to summit all 14 eight-thousanders, but with the aid of supplementary oxygen; in 2011, Austrian Gerlinde Kaltenbrunner became the first woman to summit all 14 eight-thousanders without the aid of supplementary oxygen. From 1950-1964, all eight-thousanders were summited. s of May 2019[ [update]], K2 remains the only eight-thousander not summited in a winter ascent.