The Oldenburg was a 4595gt German steamship built in 1914. She measured 117x15x9 metres and had triple expansion engines. She was bombed and sunk by British aircraft in April 1945.
The wreck lies intact on her starboard side. The top of the bow is the shallowest part at 25m and the stern is said to lie in 60m (there was no sign of it at 51m when we dived her). It would be feasible to shore dive the Oldenburg - the E39 runs right next to the dive site at Vadheim. A very good wreck, though a bit off the beaten track.
By coincidence, there is another Oldenburg sunk in this area, a massive 8537brt vessel torpedoed off Stadt in 1943. The wreck has not yet been located, as far as I know.