Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Up Periscope - Great submarine WW2 yarn

This is a very good story about a young man on an important mission against the Japanese in World War II. He must be ferried on a submarine which has its own problems. The author also wrote Silent Ship, Silent Sea, one of my favorite stories. This book has been out of print for awhile and has always been overshadowed by Beach's Run Silent, Run Deep. But check it out if you can find a copy.