Instruct: Classify Amazon reviews into positive or negative sentiment
Query: "Incredible" is an understatement

I went into this book, after reading the jacket, thinking, "Oh, this sounds interesting." By the end, the book had moved me to tears three or four times. I cannot say enough about this fascinating, unreal, unbelievable story and the powerful effect it had on me. Never before have I read of such fortitude and awe-inspiring strength than that exhibited by these brave, amazing men. It was such a terrific read, I didn't want the story to end! But thank God, for those who lived to tell it, it finally did. If you like true-life adventure, even just a little bit, then you must read this tremendous story. Remarkable and unbelievable from beginning to end.