German auxiliary cruiser Atlantis
http://en.wikipedia.org/wiki/German_auxiliary_cruiser_Atlantis
The German auxiliary cruiser Atlantis (HSK 2), known to the Kriegsmarine as Schiff 16 and to the Royal Navy as Raider-C, was a converted German Hilfskreuzer (auxiliary cruiser, or merchant or commerce raider) of the Kriegsmarine, which, during World War II, travelled more than 161,000 km in 602 days, and sank or captured 22 ships totaling 144,384 tons. Atlantis was sunk on November 21, 1941. She was commanded by Kapitän zur See Bernhard Rogge, who received the Oak Leaves to the Knight's Cross of the Iron Cross. Such commerce raiders do not usually engage other warships, but rather seek to sink enemy shipping, similar to the work done by submarines. As such the measure of a commerce raiders success is both the tonnage destroyed and the time spent at large. In the former, Atlantis was second only to Pinguin and in the latter had the longest raiding voyage of any of the German commerce raiders in either world war.