Black Sunday is an "old as hell" movie (1977). Special effects were probably pretty hokey back then.

Never actually saw the movie, but yeah... that was back when disaster movies were all the rage (Towering Inferno, Earthquake, etc). People couldn't get enough of these movies and Hollywood just kept on churning them out.

Luckily no one has ever tried to put Black Sunday into practice. At least no one that we know of.