I recently bought the third edition of Martin Edge’s ‘The Underwater Photographer.’ What a great buy. Covering all aspects of the art/science of underwater photography with a requisite blend of theory and practice, the density of wisdom inherent in the structure and content demands reread after reread. Try this: buy the book, read it cover to cover, and then go out and shoot something challenging. Review your results, note your mistakes, come back to the book and invariably there will be a kernel of advice that you have read but not applied. Thanks Martin! My only question is where are the big pelagics?