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I saw this when I was about six. Somehow I convinced my grandpa to let me watch it with him and I had nightmares that night. I dont remember if it was even a real horror or suspense film, but I remember being scared and hiding my eyes.
I remember there being a lot of white on set (walls, ceiling, floors) and i think they were on a spaceship, or in some underground facility (high tech and clean). The only scene I remember for sure is a guy in a blue suit going to a grate in the wall (air shaft?) and I think he went inside and died somehow. I don't remember seeing a monster, or a ghost, I think it was some alien ghost thing (like the presence of Death in Final Destination).
So far that's all i've got. Guy in a blue suit (in my mind i see him in a Star Trek suit but that's just by conscious replacing information), invisible killer, space/high tech facility, and I remember there being only a handful of characters (like on the Icarus in Sunshine).
If anyone can provide a small list of possibilities, probably sci-fi movies made before 1998, I'd be so grateful.