Commander Paul Davidson is not a submariner himself, but through detailed research, wide reading, and lengthy discussions with current and former submarine commanding officers, he has written a most comprehensive and interesting account of the capabilities and utilization of the submarine as both a tactical and strategic weapon over the past 100 years. His book gives the reader a unique insight into the world of the undersea warrior. - Commodore Michael Dunne AM RAN Retd. This book presents a comprehensive exploration of the Australian submarine service within the broader context of global submarine warfare history. Delving into extensive research and literature, it meticulously traces the evolution and operational trajectory of submarines, spanning from their rudimentary forms a century ago to their pivotal roles in both World Wars, the Cold War era, and the contemporary proliferation of conventional and nuclear-powered submarines across various naval fleets worldwide. A focal point of analysis is the in-depth examination of the renowned 'Perisher' course, illuminating the training regimen for submarine commanders. Through insightful interviews with multiple Australian captains, the book extracts valuable lessons on effective leadership that transcend maritime warfare. Throughout its narrative, the book interweaves historical anecdotes highlighting the formidable potency of submarines as formidable instruments of war, capable of serving as deterrents and, if necessary, as destructive forces. Consequently, it provides a timely and pertinent overview of the burgeoning significance of submarines within the landscape of international naval conflicts. Paul Davidson did national service as an Air Force officer in the Vietnam War era, before spending 15 years as a clinical psychologist in Australia and New Zealand, and 30 years as a university business educator, including six years teaching in the Royal Australian Naval Staff College at HMAS Penguin. More recently he served as a naval officer in the Submarine branch and instructor in the Australian Defence College, and in naval strategy. He published academic papers and widely recommended books in the field of Management, Human Resource Management, and Project Management. Now, he has brought his scholarship to bear as an amateur naval historian, in writing about Australian Submarines and their place in the history of naval warfare.