About the book: 1999 / The reference book offered to the attention of readers contains information about the tactical and technical elements and career of submarines that were part of active formations, were under construction or included in shipbuilding programs of the Imperial Japanese Navy in the period from October 1918 to August 1945. A longitudinal section of submarines is schematically shown, their appearance in two projections during different periods of service. The reference book is intended for historians, students and cadets of naval institutions, as well as for all those interested in the history of the war at sea.