YPCT is investigating the source of a massive, window-rattling boom that had residents from Moonta to Kadina to Cunliffe scurrying outside in search of a cause last Wednesday evening at around 5.30 pm.
The mystery deepened on Thursday with Kadina police saying not only were there no reports of any damage but no one had called to report the incident.
In the past, blasts from the army's El Alamein range across the gulf on Eyre Peninsula have been audible on NYP with the right weather but an Army spokesperson told YPCT there was no testing going on that day.
The idea of a sonic boom doesn't fly either, with a spokesperson from Edinburgh airbase saying it would be highly unusual for their craft to have that sort of impact and, after checking their records, he confirmed there were no jets in the sky that evening.
YPCT is seeking information from Primary Industries to establish if the boom came from a mine explosion, possibly near Wallaroo.
Comment: Or possibly a meteorite exploding overhead?
I have "inside" information that some pilots in the Australian air-force breach speed rules for entertainment. What they do is fly some distance off the coast, away from people, and then let their engines rip, causing a monumental sonic boom which can be heard many miles away. The effect this has is devastating to the marine wildlife, since the jets are often flown very close to the water. But of course it's all just "harmless" fun.