Recording collected in 1959-1960 during the Franco-Dutch expedition organized by P.-D. Gaisseau with the help of G. Delloye who succeeded in the first south-north crossing of the island of New Guinea, in its part then under Dutch control. The expedition is financed in particular by a film shot in 35 mm: the sky and the mud, Oscar for best documentary film in 1961. They spend 3 months visiting the Asmat tribes, with the help of a Catholic missionary who introduced, then they launched an assault on the central mountain range by going up the Steenboom river, a tributary of the Eilanden. They then make the first contact with the Papuans of the mountains who inhabit this valley, and still use stone axes, which they call "pygmies" because of their small size, then with their cousins on the other side of the pass, the Eipomeks.