From official records, this in a history of the English submarine service and largely its record during the World War. The bulk of the book gives accounts of various submarines during the war successes and disasters -- the heroic action at Gallipoll, etc. Since the majority of the book was written some time ago, the closing chapters on the submarine since 1918, are to some extent water under the bridge. Authentic, detailed record, to whom it may concern. Men -- naval students -- largely.