Look at the minefields shown on Jim's map. They are not near the harbors, they are a large barrier all along the British east coast, many miles out, and many miles wide. They are underwater to allow surface ships through but catch submarines that are submerged in that area.
If you're not careful you will find out exactly where they are. Sooner or later.
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“Never do anything you can't take back.”
—Rocky Russo
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