There was a thread awhile ago about "atomic noir" movies that mixed film noir with themes of atomic anxiety and there was some reference to a movie about some people being held hostage in an abandoned town about to be destroyed by an imminent atomic test but some question about the title.
Well, I just came across it.
It's "Split Second" 1953, directed by Powell.

NMS
There was a thread awhile ago about "atomic noir" movies that mixed film noir with themes of atomic anxiety ... question about the title. Well, I just came across it. It's "Split Second" 1953, directed by Powell. NMS

I wanna see it.
W : )
There was a thread awhile ago about "atomic noir" ... it. It's "Split Second" 1953, directed by Powell.

I wanna see it.

Not widely available for sale or rental... but I'm pretty good at finding rare movies.
You can get it here:
http://www.yammeringmagpie.com/catalog/product info.php?products id=96

Sounds like a good movie.