I once sank a carrier by ramming it and the one beside it by pushing it out to sea....
However both were basically sunk by torps in shallow water at Tawi, but wouldn't go deep enough to register sunk. I rammed one enough that it finally sunk, the other I put my bow against the bridge and was able to push it just enough to deep water that it went under....Rather funny, but was rather mad they wouldn't go under...
Realistic...not hardly.