I enjoyed it, if the subtitle was a little misleading. I would say this is more of a beginners guide to how the oceans work, with a few "extraordinary" facts you don't already know scattered throughout. I think most of this is fairly basic knowledge for anyone who's watched a few undersea docs, but still an interesting read. If you're doing to dedicate a section to threats though, you've gotta devote one to conservation. Just one person's opinion.