Dreamlike
The film has a very unique atmosphere to it. It's an early zombie film and probably one of the last to treat zombies as supernatural living corpses rather than a product of disease or radiation. These zombies are the undead guardians of a sunken cache of diamonds who are adorned with sea weed, immune to physical attacks, and held at bay by the presence of flames. Over the course of the film, a beautiful and adulterous woman joins their ranks. And the film's opening and closing credits feature the silhouettes of the underwater zombies as they themselves were welcoming the audience and bidding them farewell.
Yet, it's mostly dreamlike because it's all just so forgettable and an audience member has about as much a chance at vividly recalling a dream which they had as they do of remembering the characters or events of this picture. I've seen it twice now and I've left both viewings remembering very little. It was only in reading an in-depth critique in another topic that the events of the film all came running back to me. I'm sure I'll see it again next October and have the same memories come pouring back in only to lose them again within minutes of the film's end; a passing return to a dream.