Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Graham Dives

It has long been established that Graham Hancock has a lust for the unusual and ancient; this book, "Underworld" fulfills that passion to perfection. Hancock takes the reader on a global hunt for sunken civilizations that were inundated during the melt off of the last great Ice Ace. A melt off, by the way, is still taking place today. Provocative reading and spellbinding. Read this book and glimpse the ancient world as it was twelve to twenty thousand years ago! From India to Cuba and Japan with many stops in between.