While the story is a fictitious spin on history things never descend into full-on fantasy. A lot of work went into making everything feel as authentic and period appropriate as possible. It also takes itself very seriously. The natural horrors of the situation take precedent over the supernatural ones. So, we're largely watching the characters minds break and the terrible things they'll do to survive with the monster attacks only occasionally being thrown in. While this emphasis on human drama and desperation make it an easy show to respect, it doesn't always make it exciting to watch. The slow pacing was at times a real hinderance to my enjoyment. There are entire episodes where all that happens are conversations. Which is great at maturely portraying the gradual degradation of the crew's sanity and morals, but not so much at maintaining the attention of those watching. If you have the patience though this genuinely a good show. Thoughtful and horrific with some decent creature-feature action thrown in for good measure. I just wished there was some more going on at times.