Zantoro was the only competent one. Without him, all the others would've been zombie food early on in the film.

Those SWAT guys were a bunch of grossly incompetent buffoons.
You've seen Guy Standeven in something because the man was in everything.

Hell is redolent with many instances of stupidity that only a Bruno Mattei flick can deliver:
The endless reels of stock footage that sometimes doesn't come close to matching the character's surroundings
The sexy reporter lady who decides the best way to "interact" with a savage tribe is to strip butt-naked and paint her boobs with tribal symbols;wear a leafy G-string between her buttocks
All the SWAT team guys are crude,macho caricartures who overact every line & situation when they encounter the living dead
nearly EVERY scene/music/zombie(!) is swiped/copied from a Romero/Fulci film.