They put out signs before and after - the challenge was to convey a message to people with rich oral language skills but no written lnaguage traditions at all - so yes, they used pictures | graphics to convey danger - not with any real success.

That challenge aside some would say it was a cursory and very much token effort as at that time in history indigenous Australians were considered to be part of the fauna of the unihabited Terra Nullus with no rights other than some use as test subjects for the effects of the new toy.

Probably worth mentioning they also dusted Adelaide with fallout including a young Tony Blair, a future UK Prime Minister.

But very much worse near ground zero.

Re: youtube link - that's just to a 1986 song about the testing from Gossip by Paul Kelly - I dare say it's "broken" due to geo-locking (it works fine here in AU) - https://www.paulkelly.com.au/lyric/maralinga-rainy-land/

Thanks, nice background to the whole event. I wonder why so little of it is part of wiki.

Yes, song is likely geo-locked, but youtube just gives vague "video not available". Weird, it's usually more generous on error messages.