Udren Zom Central. A nine-man Japanese expedition was led by Koji Hirai. On August 10 Toshinori Niwa, Koji Morita, Nobuyuki Sakurai, Terunobu Ishii and Michio Kubota climbed to the top (23,229 feet) from Camp IV at 22,000 feet. This was the first ascent of the central peak of the group. The slightly higher main peak was climbed in 1964 and the lower south peak in 1967.