between 21 july and 22 august 1958, preparations were made for deepfreeze iv. on 23 august 1958, "brough" departed for her third trip to dunedin, n.z. and her third consecutive year under the operational control of commander task force 43. arriving in dunedin on 22 september, she departed almost immediately to continue her usual duties on station between new zealand and antarctica. between 23 august and 19 november, "brough" was at sea 78 days and in port only 8 days.