Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Too simplistic in most respects to be of value

Bret Gilliam published an excellent book called Mixed Gas Diving (no longer in print). After reading it, I purchased this book in hopes that updated information concerning mixed gasses and decompression models would be discussed. Much of this book is basic OW information with the history of dive tables and a discussion of profiles which have indicated an increased risk of DCS. Very little here for Technical Diving, except an overabundance of warnings about diving beyond 100' (which is well within the range of even basic OW cert). I had hoped for information for those of us who understand the risks and pursue depth as a means of exploring wrecks and caves that the rest of the world never sees. Good Intro to diving to 100'or so, not very informative beyond that.