The Carstensz expedition was made in 1936 by Anton Colijn, Jean Jacques Dozy and Frits Wissel. They left on October 29th, 1936 from Aika, a town on the southern coast of Dutch New Guinea and returned on December 24th. The aim of the expedition was reached by climbing the highest peak of the Carstenzgebergte, which at the time was the snow-covered peak of Ngga Pulu (then about 4,900 m). Since 1936, massive snow melt has caused the nearby rocky spires of Carstensz Pyramid (a.k.a. Puncak Jaya) (4,882 m), which the expedition was unable to climb, to become the highest summit.