I did go through once during August '39 and found it interesting. Sort of. There were a number of merchants, a few coastals, a few towns, and such. No issues with water depth. I will not do it again. Once was enough and the year was appropriate for a shakedown with a new crew. We went up to Great Yarmouth for a peek, Newcastle upon Tyne, then home.
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html