The 1909 Duke of the Abruzzi expedition reached about on the southeast ridge before deciding the mountain was unclimbable. This route later became known as the Abruzzi Ridge (or Abruzzi Spur) and eventually became regarded as the normal route to the summit. In 1929 Aimone de Savola-Aosta, the nephew of the Duke of the Abruzzi, led an expedition to explore the upper Baltoro Glacier, near to K2.