This remains a tense drama, and I can't help but think that something like this could easily happen no matter what the disclaimer at the end of the movie says.
Googlevideo has it online:
director Sidney Lumet creates an incredibly stark tension, evoking a real sense of what it must have really been like during the Cuban Missile Crisis with the seconds ticking away in dread
The New York Times says it
is definitely in the area of those films that are important and are going to be talked about. And it packs a melodramatic wallop that will rattle a lot of chattering teeth.