These munitions and explosives facilities were designed to be in a sheltered poition, but central enough to provide for the stocking, maintenance and drawing of the supplies.
Guards posted at this site remembered their wartime experiences here: "At nignt it was a bit tricky... being only young and left out in the open.... with goats and crocodiles sneaking up on the fences making a lot of noise.." 
"The Fances Bay Magazine guard was the worst... being eaten alive by sandflies and mosquitoes. 
They were shocking. Protective action was to use the citronella. They loved that. They used to drink that.. OH boy!".
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.