Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ugh, what a terrible Nova episode.

This was such a dissapointment. While the story does seem to capture the stress and innovation of this creative process, the structure of the storytelling leaves a lot to be desired. The biggest narrative hole was leaving the resolution of the hull leak unexplained. And in the end, all we get to see is the bottom of some murky british coastal waters... zzzz.... I could have just sprayed green paint on my reading glasses and gotten the same effect. Hasn't the sub been taken to more interesting waters? Or did the billionaire's goal merely consist in constructing a groundbreaking machine so that he could then shelve it next to his army tank and other world war memorabilia?