The one film I’ve never been able to figure out was something I watched on TV.  Not sure if it was a movie or tv show.  Saw it when I was a kid and it left an impression on me.  Would have been made before 2005.

It showed hospital beds of diseased/zombie people that they were apparently trying to cure.  As well there was a bunker or something where they kept more zombie people that apparently were too far gone.

Someone went down in the bunker for some reason and when he tries to get out the zombies come for him and some humans seal him in.

It was in english and in color.