Portsmouth has a sub net at the narrowest point of the channel in, and also a rather shallow section you'll have to surface to get over. So therefore, do it in very low vis otherwise your conning tower will get peppered by the shore defences. Scapa Flow...well...it's a nest of zerstorers so watch your step, but the northern section of the eastern approach has a subnet and a gun/searchlight combo which can cover the north and south section so, once again, do it in low vis and watch out for the zerstorers when you've hit your target.
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