Submarine Drone - Is There One?

Submarine drone. Those exist, right? So so the first part of thestory is, yes, there are such things as underwater drones. If you were china and you wanted to discourage people from doing exercises in your waters, but you didn't want to start a shooting war, how would you do it? I would bump, bump a drone into a submarine. I wouldn't make it explode, but i'd bump it. Black nose, black eye. You o, bloody nose. Maybe here's another thought. Theoretically, i see no reason that u f os wouldn't spend most of their time under water,. Cause that's where more stuff is, more real state