Only when I was up on Mt Washington overlooking Pittsburgh did I see this old submarine moored on the Ohio River.  It is part of the Carnegie Science Center and is the USS Requin – a Tench class submarine.  She was built at the end of the Second World War and was activated just before hostilities ended.  She then had a career in various roles before being struck from the fleet.  Initially she was a museum piece in Florida but, after the organization preserving her folded, she eventually found her way to Pittsburgh and that is where she remains.  If I go back, maybe I will get a chance to take a closer look.