Instruct: Classify a review into positive or negative sentiment.
Query: A fun technical thriller

A reader of Nimitz Class may sometimes find it difficult to keep in mind that the book is fiction, because the military and political details seem so realistic. The US military officers are strong and exciting characters. The author has made good use of excellent military advice, particularly about the ways of the British Navy. There's a low-level background of preaching about keeping a strong military. Some parts of the story do strain credibility. For example, principal characters move in international venues, easily using English everywhere. But this is a minor objection, easily suspended. The book is a great technical thriller, with lots of mysteries and surprises. I especially enjoyed the details of running through the Bosphorus underwater.