It's not really a "reading" sort of book, but I recently acquired a copy of DK's
Reef, which contains hundreds of pictures taken by the Scubazoo team of coral reefs and the creatures that live on them. Really magnificient photography, if the subject interests you.
Just for the sake of relevency, here's a picture from the book of a wrecked Catalina in Biak harbor:
Creepy, huh?