Scapa
By 
SMS BAYERN down by the stern and sinking at Scapa Flow.
On the occasion of its 100th anniversary, I wrote a short history at the National Interest of the scuttling of the German High Seas Fleet at Scapa Flow:
On June 21, 1919, the crews of seventy-four German warships attempted to scuttle their vessels in order to prevent the Allies from taking them. Over the course of a few hours, fifty-two modern warships sank. In the modern history of naval combat, there has never been an event as devastating as the self-destruction of the German fleet at Scapa Flow. The scuttling immediately became legendary, closing one chapter of German naval history and opening another.
And apparently you can now buy salvage rights to some of the remaining wrecks on E-bay…