Yeah, the llA & D boats (my favorites) are a real challenge fuel wise. I always made it back, but then I ran "fuel cautious" right from the pier.
I made it round trip from Kiel to Trondheim, Norway. I spent a lot of time running at 2kts submerged & then Up to charge & back down to run at 2kts, but it was a successful patrol. It just took a lot of time...
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