This book presents a day-by-day account of the Royal Navy’s Submarines throughout their first 100 years in operation, celebrating the heroic feats and everyday life above and under the sea. It examines the development of the submarine arm from the keel laying of the solitary Holland One in Februrary 1901 right up to the keel laying of the Royal Navy’s new HMS Astute exactly 100 years later in Februrary 2001. Important technical developments and specification tables, analysis of single submarines or a whole class of craft notable actions, important individuals and more unusual events are all examined in authoritative detail. Also included are details of all fourteen submariners who have won the Victoria Cross and information on all preserved Royal Navy Submarines currently open to the public. Complementing the text are many images and drawings of the men and vessels that have shaped the first hundred years of the Royal Navy Submarine Service.