the noiseless floating motion and the figures moving about this craft with the red background.

I was a 2nd shift foreman at a rubber factory.  At break time (8pm) one of my men called me outside where he had been having a cigarette. He pointed above and to the left of us.  Some type of vehicle was, very slowly, floating from the northwest to the southeast. There were a series, slanted downward, windows in the craft. We could see figures moving about and some were apparently looking down out of the windows. The background behind the figures was red, making the figures look like silohettes.  The strange thing about the craft was the rather bobbing motion it had while moving along as it wasn't a smooth motion.  We watched it for about 10 minutes altogether.  Because of the darkness it was impossible to see much of a shape of the craft other than the lighted windows were in a curved arc.  I have been rather hesitant in talking about this sighting.  I rarely mention this to people as they look at me like I'm a little demented.  I only believe what I see and this I did see.
Date is approximate.  PD