The Submarine in War and Peace: Its Development and its Possibilities by Simon Lake is a comprehensive exploration of the evolution, design, and future potential of the submarine as both a military and civilian vessel. Drawing on his own pioneering experience as an inventor and engineer, Lake traces the history of underwater navigation from early concepts and experimental crafts to the sophisticated submarines of the early 20th century. The book delves into the technical challenges and breakthroughs that shaped submarine development, including propulsion systems, hull design, buoyancy control, and life-support mechanisms. Lake provides detailed accounts of the submarine’s role in naval warfare, particularly during World War I, highlighting its strategic impact and the dramatic shift it brought to maritime conflict. Beyond warfare, the author envisions a future where submarines serve peaceful purposes such as oceanographic research, underwater salvage, and even commercial transportation. Richly illustrated with diagrams and photographs, The Submarine in War and Peace offers both a historical record and a visionary outlook, making it an essential read for those interested in naval history, engineering, and the boundless possibilities of underwater exploration.