Well, I finally pulled it off. Just outside of Londonderry I found a large convoy surrounded by five Flowers and a Hunt I. They were trying very hard to sink a VII, but I got there just in time to make all those corvettes into pretty mushrooms of glowing bliss.
After sinking the entire convoy, including all escorts, I called the captain of the uboat up to the carrier deck for a drink. Then I drilled him for five hours on what
submersible means. I hope he got the message.