Chosen Survivors, d. Sutton Roley (1974)
Briskly ticking pretty much every box on my mental clipboard, Chosen Survivors is a 1970s US sci fi drama set in a sealed military bunker which quickly becomes a horror and disaster movie. The titular survivors arrive drugged and disoriented by army helicopter, and are herded into the shelter by soldiers just a few minutes ahead of a worldwide nuclear apocalypse. The race and gender balanced group are from all walks of life, and are people prominent in their own fields selected to be preserved for posterity, i.e. it’s going to be their job to repopulate America (they’re all a bit too old for this, by the way, surely what you’d really want is a few teenagers?).
The trouble with this deep shelter set in an ancient cave system, however, is that the hole is already populated – with millions of vampire bats – who are both pissed off at the intrusion and delighted that their larder has been filled. What follows is messy, as (poorly) optically imposed bats feed on middle aged character actors, some of whom fight back and some of whom just flap and flip around until the bats empty them. It’s good fun. To observe as fictional entertainment, I mean, I can’t imagine the reality of it would be anything other than nippy and unpleasant.
Here’s a spoiler: the best thing? It’s not even a real nuclear war, it’s just a drill. Oh, the irony!