On 4 June they reached an impasse on the north bank so Tilman and Ang Tharkay reconnoitred a buttress to the south which appeared to be insurmountable. From the north bank they appeared like ants on a gigantic wall but at the end of the day they returned to camp having found a clear path beyond the buttress. They named the location Pisgah because from there they could see the summit of Nanda Devi. Two days later the team became the first people to enter the Sanctuary. They had taken nine days to cover four miles and success had always been in doubt.