The Wharves
Oil Installations
The Railway Station
Coast Defence Guns
Rongotai Airfield
Electrical Generating facilities
Following the original assessment of 8 x heavy guns and 12 x light guns in August 1941, the new requirements were upgraded to 48 heavy guns, and 48 light guns. In the end six sites were chosen to mount the heavy guns. Tinakori Hill, Mount Victoria, Johnsonville, Point Halswell, Somes Island, and Pol Hill (Brooklyn). The batteries were each to mount four guns, the exception to this was Johnsonville which only mounted two due to an improvement in the war situation. The control of the batteries was to be exercised through a combined HQ built under the Dominion Museum.
The Tinakori, Brooklyn, Mt Victoria and Point Halswell positions contained very similar gunpits and command posts. These were all based on a British design, and were concrete intensive. The Somes Island position was built to a modified design that used less concrete, and also allowed the guns to take up a secondary role as a close harbour defence battery.
