Ime getting to the Liverpool harbor or even just the inlet is much more difficult than sneaking into Scapa Flow or Lock Ewe. Escorts just love to find any kind of type IX's there with that huge bullseye of a massive hull. Even with a type VII getting into Liverpool even early in the war is difficult at best (made worse that its shallow) or Bristol. Later in the war anything inside the Irish sea is suicide unless you've got mega paitence to spend most of your time submerged at silent waiting for the chance to pop up long enough to at least re-supply your air and some battery power.
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