Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Tedious until the satisfying finale.

Prepare for hard sustained effort to read through the first three quarters of the book. Tedious and slow. However, Watts does create a detailed realistic underwater world throughout. The final section of the book is where the action, what there is of it, commences and leads to a fascinating conclusion. The final section demands a sequel. In fact, this entire book could be considered a long prequel to a potentially more satisfying and exciting second novel.