Cho Oyu, Illegal Crossing into Tibet. A member of an expedition on the Tibetan side of Cho Oyu reports on another illegal attempt made from Nepal. Two Serbians crossed the Nangpa La about October 20 and camped below the west ridge of Cho Oyu. The next day Chinese officials came up to look for them, but the Serbs evaded detection and headed up Cho Oyu. They did not reach the summit. When they came down, the Chinese were waiting and arrested them. They took all their equipment, but not any money, and escorted them back over the pass.