Zombie Holocaust

I first saw this in the late 80s on a vhs. Revisited it recently. Found the film very shocking then due to the gore but aft revisiting it, found it to be boring cos almost for 34 mins nothing happens. We have lots of nudity by Alexandra Delli Colli, who in her short career is noted for the kinky female from New York Ripper. In this movie, there is nothing new except for the gore. Even the plot is stale - A team of scientists travel to a remote island aft witnessing cannibalism in various city hospitals by immigrants from a particular island. On the island, the team is shocked to come across cannibals n zombies. The make up effects of the zombies is lol. Jus plain human in torn, raggy clothes. Till now, i haven't been able to fathom how can u pierce someone's belly by a bamboo. In this movie, a female falls into a trapping pit laden with pointed sticks but survives.