The Graf Zeppelen was German's only aircraft carrier. Launched in 1938 it was never completed (it was about 95% done), comissioned, or saw action. It was scuttled late in the war, refloated by the Soviets, then used for target practice in 1947.
If you are into marine archaeology and/or WWII history, you may find this of interest.
Photos
http://www.navy.mw.mil.pl/index.php?...id=1728&limes=
Current Story on the discovery
http://news.yahoo.com/s/ap/20060728/...zi_shipwreck_1
Wiki page on Graf Zepplin
http://en.wikipedia.org/wiki/German_..._Graf_Zeppelin