What evidence exists for underground facilities in Australia?

Australia's underground landscape is enormous and mostly public: deep hard-rock mines, the underground township at Coober Pedy, metropolitan rail and utility tunnels, decommissioned wartime shelters and acknowledged defence installations.

Any serious inquiry starts by ruling these in, because most striking 'anomalies' turn out to be one of them.

State mining tenement registers show who holds rights to what land. Geoscience Australia publishes borehole and geophysical survey data. Satellite imagery is freely available at resolutions that show vehicle movements and spoil heaps. Heritage registers list former military sites with descriptions.

Freedom of information requests are slow but real, and refusal notices themselves reveal which agency holds what.

Excavation produces spoil measured in millions of tonnes. Occupied facilities need ventilation shafts, power, water and waste removal, all of which appear in imagery and in utility infrastructure. Construction needs contractors, and contractors leave procurement trails and employment records.

Where none of these traces exist, the facility does not exist at that scale.

Facilities like Pine Gap and Exmouth are acknowledged, mapped and debated in Parliament while their internal operations remain classified. Treating classification as proof of an extraordinary claim confuses two different things.

The honest position on a classified site is that you know its location and stated purpose and not its details.

Write down the specific claim, list what evidence would confirm and disconfirm it, then go looking for both. Publish your method with your conclusion.

This is the practice of light the order actually asks for: curiosity disciplined by evidence.