I damaged my hull sneaking into Portland, England today and this was just a periscope depth in a Type II-A. Real shallow waters there.
I now have to escape on surface after not sinking the T2 Tanker which took my three remaining eels and did not sink.
The good thing is that I seem to have made it through the Channel unscathed as I've moved bases from Wilhemshaven to Brest.
I doubt I'll be this gutsy again, but since I was given no patrol grid I just figured I would attack what ever I encountered. Then I decided to stop along the harbour for some Fish and Chips.