The ship returned to McMurdo Sound on 28 October 1956 for "Deep Freeze II", having made the earliest seasonal penetration in history. Glacier then delivered stores and supplies at McMurdo and then Little America, she led seven other ships of the Royal New Zealand Navy (RNZN) through the ice pack to the two Antarctic bases. In January 1957 she led two cargo ships into Vincennes Bay where the last of the seven American bases for the International Geophysical Year was to be constructed. Glacier departed Wilkes Station on 17 February 1957 for the United States via Melbourne when the operation was completed.
