Well it was pretty interesting. There was an old DSR AGI which you could go. Being an ex-golly I almost had a sex explosion in my kex.
There was also an historical exhibition and tour around a Rugenfisch ship and teh actual canning plant which was good (bearing in mind I actually visited a cement works when I went on holiday to Czechoslovakia). They want to relocate an old Volks Marine "Libelle Klass" there from its current location at the VM museum on the island.
I know this probably isn'ty the right place as its in Nemo's realm forum... but I would really recommend going to the Isle of Rugen as a holiday. Fly cheap to Berlin and then its 2 hours on the train from the airport. Its a fantastic place.
When I was in St.Petersburg (Russia) a couple of years ago we were moored opposite a working submarine. I was astonished to be told that I could photograph & film it as well. I would love to seen inside though...