Threads is very disturbing movie aired by the BBC in 1984, showing the lead up to and aftermath of a nuclear war.
The into is very apt, our strength and weakness is the threads that connect us.
The premise was the cold war going hot suddenly, but many nuclear weapons remain today and only a dozen or so could cause serious disruption and the very real likelihood the of societal collapse depicted.
Of course several other possible scenarios could produce the apocalyptic collapse described, but surely nuclear war is one of the worst, especially considering the widespread radiation enduring for decades or even centuries.
Extremely disturbing and quite depressing
<more to come>