I'm just south of Portsmouth right now... happy hunting grounds (4 merchants for ~10,000 tons) on my way to BE31. This is early war...Sept 1939. I'm not going to try it later in the war. Learned that from AoD.
Closest enemy warship came within 5 k after a sinking. Kept very close tabs on him for a bit...
It's nerve wracking hearing there's only 33 meters under the keel

, but so far my Channel trip has been worth it.