In 1936, the Dutch Carstensz Expedition, unable to establish definitively which of the three summits was the highest, attempted to climb each. Anton Colijn, Jean Jacques Dozy and Frits Wissel reached both the glacier-covered East Carstensz and Ngga Pulu summits on December 5th, but, due to bad weather, failed in their attempts to climb the bare Carstensz Pyramid. Because of extensive snow melt Ngga Pulu has become a subsidiary peak, but it has been estimated that in 1936 (when glaciers still covered of the mountain; see map) Ngga Pulu was indeed the highest summit, reaching over .