BUNKER is WWI horror, which is a setting you don’t see in the movies that often. Then again, WWI documentaries arguably fit in the horror genre, so maybe that’s not so much of a surprise. Anyway, GeekTyrant has a clip from the movie here, which led me to look up the original.
It’s supposed to be out now, but good luck finding it.
It’s not easy to out-horror World War I. “All Quiet on the Western Front” is a horror show, no zombies, vampires, or ghouls needed.