Not scary but it's a good story
I remember watching this movie on TV during a summer weekend when I was a kid. It’s about a luxury liner that gets rammed at sea. The few survivors find themselves upon a haunted World War II Nazi transport ship. It tries to kill the people one by one because it needs their blood to survive. Most of the film is pretty routine like equipment turning itself on, a record player that keeps playing, etc. There is one great scene where a woman gets trapped in a shower while blood comes out of the shower head. It’s not scary but it’s a good story and well executed.
The movie title "Death Ship," available on Prime Video, has received an average rating of 4.0 from 359 reviewers. 
It features elements such as IMDb 4.8, 1 h 30 min, 1980, X-Ray and R, and it is priced at $7.99.

This title falls under the categories of Suspense, Horror, Eerie and Ominous. 
The additional details include the following in key-value format :
 {"Content advisory": ["Nudity", "violence", "alcohol use", "foul language", "sexual content"], "Audio languages": ["English"], "Subtitles": ["English [CC]"], "Directors": ["Alvin Rakoff"], "Producers": ["Derek Gibson", "Harold Greenberg", "Larry Nesis"], "Starring": ["George Kennedy", "Richard Crenna"]}

Here is a brief synopsis of the title : A mysterious ghostly freighter rams and sinks a modern day cruise ship whose survivors climb aboard the freighter and discover that it is a World War II Nazi torture vessel..