The last US sub to hit anything surfaced under a tourist boat, I believe. Maybe you are better informed than me. Mostly what they hit is totaled in tonnage sunk. Maybe even the tourist boat.
Ummm....
The Obamanavy has had more than a few collisions between the new Diversity Subs and other shipping, usually other Obamanavy vessels.
https://en.wikipedia.org/wiki/List_of_submarine_incidents_since_2000#USS_Jacksonville_collision
https://en.wikipedia.org/wiki/USS_Hartford_and_USS_New_Orleans_collision