In 1889, Giles' second-in-command, W. H. Tietkins, came back on his own expedition and surveyed the area. He wrote that he travelled to the Bloods Range, to the south of Lakes Amadeus and Neale. He named the highest peaks Mount Harris and Mount Carruthers. From the top of Mount Harris, he could see Kata Tjuṯa, the Petermann Ranges and the Tomkinson Ranges. Tietkins then travelled to the east for three days, and came to Lake Amadeus. At the western end of the lake and on the north shore, he described a sandstone range, which he named Long's Range after his brother-in-law. He climbed a nearby set of hills, and identified Mount Unapproachable as the westernmost peak of the Long's Range. He reported that his team reached Unapproachable around the middle of June and then spent several days travelling around the western edge of Lake Amadeus. He corrected Giles' earlier mistake and successfully mapped the lake's western shore.