Blood Vessel is, I think, one of those scripts that practically writes itself. It is one part Night of the Living Dead, by way of a group of disparate characters brought together by dire need. In this case, the dire need is that their WWII-era ship sank, and they are the survivors on the lifeboat who have almost lost hope. There’s, and forgive me if I don’t remember everyone, basically every character from a different country at first pass; the American, the Brit, the Australian, the Russian, and maybe one or two more. And then at second pass, there’s the black dude (American), the lady (British), and the Captain (maybe also American?); the point is, everyone is different, so there’s no chance you’ll get anyone confused with anyone else. But also so there can be Conflict, and Drama.
And then mix that with two parts Dracula (or, if you prefer, Nosferatu), in that their lifeboat comes across a German military vessel, and they try to signal for help, since a) maritime law but mainly b) if they’re going to die of exposure or thirst, at least worst case the Germans will be quick. Unfortunately, there are no Germans on board, which means they got it wrong, what the worst case scenario might be.
And now they’re trapped on a boat with a bunch of strigoi, because Hitler sure does like to collect supernatural things. So, for the viewer, it’s just a game of “guess the survivor!”, with a side helping of gore and explosions. You know the type.
Was it good? I mean, no. Was it good within the constraints of its core concept? Still no, not as such. Was it worth the 93 minutes I spent on it? I don’t want to jump immediately to “no” again, but it’s worth
noting pointing out that the movie is rated TV-MA, rather than R or even PG-13.
 If you’re asking, wait, why didn’t he go down with his ship? Don’t worry, he might as well have.
 Try not to think too hard about how people from that many backgrounds could have wound up on the same ship during a world war.