This volume covers major submarine campaigns during World War II, describing operations of the British, American, Japanese and Italian submarine and anti-submarine forces. Experiences of submarine and anti-submarine warfare are featured, from the decision makers in the war offices to men in the boats. The narrow margin by which Britain escaped defeat by German U-boats in the Battle of the Atlantic is examined, along with the performance of the Japanese giant submarines in the Pacific, and the triumph of the American submarines in the Pacific. Other topics include: the capture of the Enigma cipher machines; accounts of the shooting of defenceless warriors in the water; and how the huge shipping losses on the US East Coast in early 1942 were more disastrous than the bombing of Pearl Harbor.