At that time, I found a siren at Killer Whale museum in Eden, NSW, Australia, but at that time, I didn't know what it was. Now that I know it is a Grifco 888 siren, as I watched a video with the same coincidence as mine, what does it warn for? Does it warn of an air raid or is it for a tsunami because it is located near the coast?
Here is the photo that I have taken during my return to Killer Whale Museum in Eden, NSW, Australia.
The siren is inside the highlighted circle where I drew the picture and took a screenshot on my photos app.