The Bathurst class minesweeper, (corvette), HMAS COLAC, (LCDR D. C. Northern, RANR(S)), was commissioned at Sydney. Miss M. Heady Sr, (staff of Morts Dock), performed the launching ceremony. COLAC was laid down on 18 April 1941 in Morts’s Dock, Sydney, and launched on 30 August 1941.