Hidden Cavern Networks Revealed Under the Nullarbor Plain
Geophysicists mapping trenches on Australia's Nullarbor Plain found that surface depressions are shallow expressions of extensive, deep underground cave networks formed by ancient groundwater dissolution; some caves extend 50–150 meters below the surface and connect across hundreds of meters. Electrical resistivity tomography and passive seismic data reveal broad, under-surface zones of sediment-filled and fractured rock, a collapse doline at Clay Dam Cave, and surface trenches like Koonalda and Yangoonabie marking these concealed cavities. The study suggests these caves serve as natural archives for past climates and environments and may offer Mars analogs for subsurface caves that could host life or future exploration.