On June 17th 1938 during fleet parade, U-35 was run over by "pocket battleship" Admiral Graf Spee.
As you can see, the screws of Graf Spee literally sliced the U-35's hull, one plade at time, luckily the pressure hull wasn't damaged. I can only imagine what that must have felt.
Another view.
"Bernard did this!"
More pictures and stories:
http://www.u-35.com