I found this to be an absorbing, entertaining, and well-written account of the Battle of the Atlantic (1939-1945). It came out in 1988, so I do not believe that much more has emerged, since then; the biggest change noted by van der Vat was the disclosure of the code-breaking by the Allies (Ultra) that came out in the 1970s. In particular, I think van der Vat does a good job explaining the technologies (successful and not), and the tactics (ditto) that shaped the battle. ( )