Given that the Three Gorges Dam is now full, and given what one nuke could do there (or 2 or more smaller ones), China may be joining the “civilized nations party”, yet.
It worked for Egypt and the Aswan. Not that anyone would ever blow a dam for military reasons.
Oh, yeah - don’t overlook the possibility of sophisticated remote controlled underwater weapons, designed to wait in straits and other choke points. With such a system equipped with sound signatures of ‘undesirable craft’, one would have the equivalent of an underwater Aegis system.
Been there done that but for coldwar subs its called the CAPTOR Mine it could just as easily be reprogrammed to hunt ships kinda small on the warhead yield but the MK48 was supposed to be upgraded to replace the MK67 Submarine Launched Mobile Mine, mate the CAPTOR seeker package to the MK48 moded as the new Submarine Launched Mobile Mine instant stand off deployable encapsulated mine.