There’s noises about the US sending nukes to Saudi Arabia. If so I reckon to deliver them they’d be using the BGM-109A version which can carry the W80 nuclear warhead. Those are a single fusion warhead with variable yield between 5 and 150 kt equivalent.
They have a range of about 2,500 km and so can cover the entire Middle East easily. Submarine launched versions can also target pretty much everywhere they desire.
But to the main point. And yes, I am perhaps being too paranoid but the Leaning Tower Of Feces is insane and may just go that way because reasons. I really hope I’m being too paranoid.
I’ve had a think about it and I reckon if it all turned bad after a limited local exchange in Iran and perhaps other countries, then Russia may decide to join in a lob a few small ones at Ukraine. China may also take the opportunity to invade Taiwan as the US will be pretty much completely tied-up in the Middle East. France & the UK have nukes, not sure if they’d shoot a few at Russia but I guess it very much depends on the specific situation(s). Pakistan and India likewise. South Africa might have a nuke or two as well.
The most dangerous wildcard is Israel. I would guess they’d take the opportunity to lob a few here and there as well. Get rid of their perceived & real nearby threats.
Thinking a little further, I doubt that most of Australia would be targeted if at all. Perhaps only a few US & Aussie bases such as Pine Gap, Tindal, maybe the Jindalee OTH radar installations, and maybe Amberly, etc.
I suspect that the only player that might do that is China, but the good news – if there is any – is that with ICBM’s carrying multiple warheads, I don’t think they can cover a huge area and since our various military installations are quite some distance apart it probably wouldn’t make sense to fire an extremely expensive missile at them and certainly not civil centres.
So I reckon the closest one to us, Amberly Air Force Base, may not get hit. But if it does it’s likely to be a smaller weapon. In such a case I reckon we would be pretty much okay where we are as we’re 80 km away and there’s a series of hills in between us and Amberly. Maybe some broken windows but not much more I reckon. Most of the time the winds blow in directions other than from there to here so I wouldn’t be worried too much about a lot of fallout hitting us.
Anyway that’s my paranoid worst-case scenario. If you have any thoughts I’d love to hear them.
https://en.wikipedia.org/wiki/Tomahawk_missile
https://en.wikipedia.org/wiki/W80_