How bad is it? It's an Italian horror film from the 80's; they're all pretty bad.
Should you see it? If you have patience for slow-moving horror.
Donald Pleasance stars in this dubbed film. He's digging in the Roman catacombs, when he unleashes a monster. All that's seen of the monster is a taloned hand and some indistinct shadowy distant shots. The film is atmospheric and has a decent look, but is leaden. Two faces get torn off and one heart gets pulled out.