This is a complete encyclopedia of underwater vessels throughout history, from the Nautilus and Hunley to the nuclear-powered submarines of today. It charts a century of submarine development, from the earliest attempts to travel beneath the waves, two World Wars and the Cold War, through to the incredible machines planned for construction in the 21st century. Specification boxes provide at-a-glance information about each submarine's country of origin, length, displacement, speed, armament, propulsion and complement. It features over 700 historical and modern photographs illustrating each type of submarine, plus specially commissioned artworks of selected examples. It includes a glossary of key military terms and abbreviations. This fully illustrated book traces the history of underwater travel, from the earliest attempts to travel beneath the waves to the future possibility of unmanned craft permanently roaming the seas. A country-by-country directory of over 140 submarines provides an in-depth look at the amazing inventiveness of submarine builders. Illustrated with over 700 photographs showing submarines in action, as well as a selection of artworks showing the vessels' main features, this authoritative volume provides both enthusiasts and historians with key information about the world's submarines, and is an essential reference for everyone interested in naval history.