It was a heroic time on both sides and now, with the reminiscences of Kretschmer, Topp, Dönitz, Hardegen and so many others who fought this war, combined with some who were on the Allied side, we are beginning to get the perspective we need, as people interested in accurate history, to understand truly what went on and how it felt to the dedicated men who bore the burden and gave their all.
Each chapter in this book is a separate stand alone memory of a different warrior of the U-Boat War.  https://www.sharkhunters.com/books/ will tell you all about this book with memories of Kretschmer, Hardegen, Topp, Hess, Degen and more in their own words.
Learn more about this fascinating history, available nowhere else, open this link and for information about Sharkhunters, the official history of the U-Boats, go to https://sharkhunters.com/