A team from the Assam Mountaineering Association led by Atanu Prasad Barua climbed Bethartoli South on September 28 1970. The summit was reached by Rohini Kumar Bhuyan, Khagendra Nath Bora, Instructor Sher Singh and Sherpas Pemba Tarkay, Nima Tenzing and Nima Dorje. They reached the summit from Camp II at 19,400 feet. They established Base Camp at 14,900 feet in the Nanda Devi Sanctuary on September 22. This is the third ascent of Bethartoli south.