My boss back in the 70’s when I worked for a German company was a captured U boat commander who scuttled his boat but was captured by the Canadians early in the war. He became a Canadian citizen and was generally a good guy, but I think he suffered some grief by the other Germans for surrendering too easily. Most of the other German crews went to the bottom as the war went on.
Some 75% never came back.
The only military arm that suffered a casualty rate even close to that was the Allied bomber crews over Europe.