Aussie Bob - not 'chucking up some fear' but just some timely advice. I have it on very good authority that Maralinga are sick of people dropping in without permission or prior notice, and are strongly advising that they will be considering charges of trespass for those who turn up without permission.
I would like notice if a stranger wanted to pull up their car in my backyard and expected a cuppa tea and a feed - to me, it's the same, same...