What's the Case for a Submarine to Sink Chinese Ships?

I'm worried about how that plays into the CCP's hands by giving them a story they can tell to the Chinese people. What does the US do then? Stern denunciation at the UN, maybe. But I don't see a shoe that just seems like game over right there. And if it emerges for the Taiwanese presidency, who sounds as if he and it's likely he has at least some leanings in that direction.