If you stay in that area you will find it very easy to find the Queen Mary, Queen Elizabeth and the Aquitania as well as the Empress of Britain.
When I was running OM I think I sank each one of those vessels at least three times within the same mid Atlantic area.
I didn't get medals for it. I thought it was very strange how easy they are to sink with deck guns. I think it only took 20 rounds per ship and I would have thought they would have been escorted considering they used them for American supplies and troop transports.
http://www.ww2troopships.com/ships/q/queenmary/
Note the May 5, 1940 voyage. That would be a nice group to run into.