UFOR NSW case file: Watagan Mountains, NSW, summer 1989/1990. A silent, black triangular craft with a smooth domed rear was observed terrain-following at tree height in the Watagan Mountains. Key characteristics: completely silent, no lights of any kind, smooth domed pyramid shape with no sharp rear angles, size filling the width of a two-lane country road, actively following terrain contours and gullies, apparently maintaining constant elevation from ground surface — not from sea level. UFOR NSW editorial note: “It is possible that this craft had been flying in a manner to deliberately avoid being detected by ground based radar.” This is the critical intelligence finding: a craft this size, flying at tree height through terrain-following navigation in 1989/1990, would be invisible to ground-based radar due to terrain masking. INTELLIGENCE THREAD: The Belgian Black Triangle wave ran November 1989 through April 1991. Belgian cases: confirmed by Air Force radar, F-16 intercepts, 13,500 witnesses. Australian case: terrain-following, actively radar-evading, same period, no official response. This means while Belgian authorities scrambled jets and NATO analyzed the wave, Australian authorities received no radar contact because the craft was below radar coverage by design. The two distinct operational modes — visible to radar (Belgium) and radar-evading (Australia) — occurring simultaneously in the same global wave suggests different mission profiles in different jurisdictions, not different technology. Two smaller triangular cases from NSW 1985 are also in the UFOR archive — predating the Belgian wave by four years.