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Aum Shinrikyo was a Japanese doomsday cult, they purchased Banjawarn and built a facility there. Aborigines saw about five people wearing full-length suits and helmets on the remote site in late August 1993.
The Aum group released toxic sarin gas into part of the Tokyo subway system, killing 12 people and injuring over 1000. In the subsequent investigation, it was revealed that they had purchased the Banjawarn Station, and so the AFP examined the site.
On the night of 28 May 1993 a mysterious seismic disturbance was detected in Western Australia and found to have emanated from south of Banjawarn.
There was also speculation in 1997 that this event might have been the result of a test explosion of a nuclear device they had built. It was known that Aum were interested in developing nuclear as well as chemical weapons, as they had recruited two nuclear engineers from the former Soviet Union and had been mining uranium at Banjawarn.