There are many mountains in Susbon or Susbun Valley. It is in Braldu Shigar. There are very few expeditions in Susbon Valley in 1976 German Expedition and 1982 Japan Expedition, and Polish Women Expedition led by Danuta Duska Wach 2011 organized by Jasmine Tours. The main peaks in the Susbon Group (new suggestion) are Ganchen 6462m 35 48 36 N 75 29 11 E, Hikmul Ca6300 meters 35 50 N 75 29 E, Susbun Brakk 6413 meters 35 56 10 N 75 33 50 E, Gama Soka Lumbu 6282 m 35 45 N 75 45 E, Un Named Peak 6123 meters 35 54 N 75 36 E, Un Named Peak 6066 meters 35 58 N 75 33 E, Un named peak Ca 6000 meters 35 56 N 75 32 E.
Sosbun Brakk was unclimbed although it had been attempted by Germans in 1976. We climbed it by the southwest ridge to the headwall, below which we traversed right to gain the upper slopes. Our expedition consisted of Hisao Hashimoto, Mikio Tabata, Norichika Matsumoto and me as leader. We established Base Camp at 14,700 feet south of the peak on June 14. Camps I, II, III, IV and V were pitched at 16,400 feet (at the foot of the ridge), 17,450, 18,300, 18,625 and 19,900 feet on June 17, 21, 24, 26 and 28 respectively. The weather was bad on July 1 and 2. On July 3 Hashimoto and Matsumoto set out for the top, bivouacked at 20,375 feet and reached the summit (6413 meters, 21,040 feet) at 11:23 on July 4. They descended a more direct line down the south face. In 2011 a Polish women expedition visited Sosbun Valley and explore the region.