This is by far the most helpful book on underwater photography that I have read up to now. It is not just a coffee-table book of gorgeous images. The authors have genuinely set out to teach the craft of u/w photography. Each photograph is discussed in detail - how it was taken, how the exposure was determined, shooting angle, the instructions to the model, how they got the fish to look through the hole, etc. Best of all, they teach you how to appraise other photographs, to identify the technique used and to criticise weaknesses. The images and the technique data are mainly from film cameras, but digital cameras are discussed too. An excellent, inspiring, articulate, readable and beautifully-presented book. Sits next to Jim Church's Essential Guide to Composition on my quick access bookshelf.