In order to preserve the security of its parent organisation in Britain (SIS or MI6), Allied General Headquarters (GHQ) in the SWPA agreed that SIA could live a very self-contained existence.
The casualty rate was high among Dutch and Australian operatives attempting to penetrate NEI and the islands to the north of Australia.
SIA parties operated in the Banda Sea area, flashing their signals to the net control stations at Biak and Darwin.
In 1945, not long before the surrender, SIA succeeded in establishing five excellent information and weather-reporting secret stations in the hostile Java area.
These stations were in operation at the war's end, and in fact, were continued for a while after the cessation of hostilities in order to check movements of Japanese renegade forces.