The mountains of the Gasherbrum group were explored in 1909 by the Duke of the Abruzzi and Vittorio Sella. The Abruzzi Glacier, a tributary of the Baltoro Glacier, is named after the Duke. In 1934, Günter Dyhrenfurth and his International Himalayan Expedition, including André Roch, explored Gasherbrum I and II, making it up Gasherbrum II. The first ascent came on July 7, 1956, by Austrians Fritz Moravec, Josef Larch and Hans Willenpart by the Southwest Ridge. After they set up Camp I, they had to descend, and found the camp—and all their supplies and food—buried by an avalanche when they returned. Despite this, they decided to make a quick summit attempt. After opening up a route, they left Camp III on July 6. The group spent the night in a bivouac sack and reached the top at 11:30 am the next day. In 1975, four expeditions successfully climbed Gasherbrum II, including Jean-Pierre Fresafond's French expedition, a Polish group under Janusz Onyszkiewicz, and another Polish expedition led by Wanda Rutkiewicz. Four years later, a Chilean group claimed to have used the "normal" route to reach the top. Several others, including Reinhard Karl, Hanns Schell, and Kurt Diemberger also reached the summit. On July 24, 1982, Reinhold Messner, along with Nazir Sabir and Sher Khan, climbed the peak via the Southwest Ridge. During the ascent, Messner discovered the body of a previously missing Austrian mountaineer, whom he buried two years later at the G I – G II crossing.During that year, Messner also climbed two other eight-thousanders, Kangchenjunga and Broad Peak, and attempted Cho Oyu. He wrote a book, 3 x 8000: My Great Year in the Himalaya, about this. In July 1984, Reinhold Messner and Hans Kammerlander reached both Gasherbrum II and Gasherbrum I without returning to base camp, in alpine style. In August 1984, a French expedition led by Daniel Croisot, reached summit and achieved the integral first descent by ski of Gasherbrum II, as witnessed and joined by Dominique Dock who was medical officer for the expedition. In August 1986, Gasherbrum II was successfully ascended by a Slovene expedition in only 32 hours from the base to the peak, with only 22 hours of climbing and 10 hours of rest at the altitude of 5900 m. This was by far the fastest ascent until then. In July 1996, Jean-Christophe Lafaille climbed Gasherbrum I and II in four days, without stopping at Base Camp in between. In 1997 Anatoli Boukreev achieved a solo speed ascent, camp ABC to summit in 9 hours 30 min. In 2006, Sebastian Haag and Benedikt Böhm climbed Gasherbrum II twice within a week. At 8:00 am on July 29, they reached the top and then skied down without abseiling or removing their skis. They rested for a few days before leaving Camp I again on August 3. They started out fast, reaching Camp IV in six hours, but of fresh snow slowed them down, and they reached the summit after over six hours of tough climbing. They descended on skis again, this time made even more dangerous by packed-down snow and the risk of avalanche. Despite this, they both made it safely back to Camp I in under 17 hours, whereas a normal expedition takes four to seven days. Karl Unterkircher and Daniele Bernasconi, two Italians, climbed Gasherbrum II in 2007 in alpine style. They were the first to use the North Face through China. The route had been attempted a year earlier by a German–Swiss team, but they abandoned it after an avalanche. During the attempt they fixed around of rope. They arrived at the summit around 8:00 pm on July 20, after spending the night in a bivouac shelter. A third member, Michele Compagnoni, grandson of Achille Compagnoni, turned back just before the summit. The team reunited and descended down the normal, northwest route. On February 2, 2011, Cory Richards, Denis Urubko, and Simone Moro became the first to ascend Gasherbrum II in winter. Despite being buried by a class-four avalanche, they reached the summit at 11:30 am, without supplemental oxygen or porters. Richards, who was the first American to climb an eight-thousander in winter, filmed the expedition, which he turned into the film Cold. On July 16, 2018, Felix Berg and Adam Bielecki summited Gasherbrum II making what is arguably the first ascent of the true West Face.
