In terms of getting a feel for realism and such like, might I suggest the book by Wolfgang Hirschfeld, "The Secret Diary of A U-Boat".
WH was a radio operator who kept an accurate diary of life on board a U-Boat and his descriptions of what he witnessed the Commander and other officers doing is very vivid indeed.
Perhaps as well, I could recommend the book, "U-Boat 977" by Heinz Schaffer for it's descriptions of the realities of commanding a U-Boat.
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