“ever sure just what the Doomsday Machine was? And was it a bluff”
This answer requires a spoiler alert.
Spoiler alert....
Ok.
At the end of the movie the Doomsday Machine goes off and destroys the world.
It was not a bluff.
After 50 years, I wouldn’t worry about “spoiler alerts”.
So why did the Russian Ambassador bother wasting the time taking pictures of the War Room if not a bluff or a con????????/