I have Das Boot and Iron Coffins and they are both great books but the following are my personal favorites and I recommend them for anyone interested in the subject;
Teddy Suhren - Ace of Aces Memoirs of a U Boat Rebel
Shooting the War - The Memoir and Photographs of a U-Boat Officer in WWII by Otto Giese and J E Wise Jr
U-Boat Ace - The story of Wolfgang Luth by Jordan (Biography)
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