Business in Great Waters: U-boat Wars, 1916-45. by John Terraine.
Over 800 pages, a classic work, comprehensive but readable. It details the complexity of the battles and the technical, intelligence and human factors involved.
There is also some interesting anecdotal content, like the tale of a U boat captain who forgot the type VII B had submerged saddle tanks and broke his neck diving off the conning tower.
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