This is U-869. U-896 never was. Close enough, though.
If you mean for a mission to be made, it might be possible. You would have to assign an objective, though. What sort of objective would it be? You couldn't say "sink 20000 tons or more" because it's 1945 and that would be madness.
http://www.uboat.net/boats/u869.htm
There is a story here:
http://www.uscg.mil/hq/g-cp/history/...ow_Koiner.html