In the 1970s and early 1980s several mountaineering expeditions applied to Pakistan to climb high peaks in the Siachen area due in part to US Defense Mapping Agency and most other maps and atlases showing it on the Pakistani side of the line. Pakistan granted a number of permits. This, in turn, reinforced the Pakistani claim on the area, as these expeditions arrived on the glacier with a permit obtained from the Government of Pakistan. Teram Kangri I () and Teram Kangri II () were climbed in 1975 by a Japanese expedition led by H. Katayama, which approached through Pakistan via the Bilafond La.