Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This could have been a written as a decent thriller (fiction)...

Instead, the authors claim it to be non-fiction. The book is so full of technical and chronological errors (many quite basic) that all possible credibility is destroyed. For example, the book states that the one-megaton nuclear warheads carried on the K-129's missile have a yield equivalent to 1000 tons of TNT; in reality, one megaton = one million tons TNT equivalent. Another simple, verifiable error is that the authors claim that the crews of USS Parche & USS (Richard B.) Russell received awards for their part in the K-129 recovery efforts in late 1968/early 1969. These two subs weren't even built yet! Also, the authors repeatedly use presented hypotheses as facts later in the book - a cardinal flaw in any form of deductive reasoning. The end result is just populist conspiracy theory trash.