Shells on the wreck of theThistlegorm (Red Sea)
Photo copyright Tim Nicholson, whose underwater photographs and photo books are available from http://www.photoboxgallery.com/timnicholson.
Shipwrecks from the Egyptian Red Sea by Ned Middleton, 160 pages (2010)
The Underwater Photographer: Digital and Traditional Techniques by Martin Edge, Paperback, 536 pages (2009)
Adobe Photoshop for Underwater Photographers by J & S Drafahl, 224 pages (2007)