Prior to the bombing of Darwin, the growing military threat the Japanese posed to north Australia was well known. In the 1930s plans were drawn up for the fortificaition of Darwin and the construction of secure facilities for high explosives.
In 1939 the land around GZ was officially acquired for this purpose. Explosives sheds were sunk below ground level but entered at floor level by roads graded down the cliff and well segregated from everything else. A variety of high explosives were held here including acoustic mines, depth charges and torpedoes.
Today, the buildings are surrounded by homes and a marina and are slowly being restored.
Take the very short walk between the 2 caches here. There is a path all the way that passes several historic buildings and dips through a lovely patch of rain forest. From here, walk down the stairs then follow the path until you reach the path going back up again and take that one.