I don't know where to begin... This was a really interesting book, and really different from the fantasy/science fiction that I normally read. And then it ended. Just ended. Not to give spoilers, but a lot happens in the last 20 pages or so. And then it just ends.
So, it was a neat actiony book about SCUBA and treasure and crazy 1960's people. It was short, which is often a plus. Except when it just ENDS!
I'd say, overall, read it. I liked all the different POVs of the characters. I liked the story. I learned far too much about SCUBA diving.
So... SCUBA!. reading scuba was a weird experience I've never read anything like that and I didn't like it but I didn't hate it, probably just not the book for me tho.