The first berserker machine was an ad hoc, spur-of-the-moment invention by Fred Saberhagen when he needed an antagonist that was big and evil but could be duped. From there, the berserker machines evolved into one of science fiction's scariest and most durable bad guys, all the more so because they are not actually evil, but just machines following their programming.
This, alas, is not among the best berserker stories. It is clearly inspired by Moby Dick, even to the point that the Ahab character loses a leg and acquires scars on his neck and face. But Moby Dick succeeds partly because Ahab is not the narrator: his actions are observed by another. In Blue Death, the narration shifts among several people, including the protagonist. There are numerous supporting characters but none with the continuity of Ishmael and Queequeg. The ending, while it offers a surprising twist, is nevertheless not entirely satisfying. Blue Death is not as bizarre as, say, Berserker Planet, which is even less satisfying, but it is still something of a disappointment.