Mk-46 works very well in this regard.
One should always consider the importance of plausible deniability.
In the last few months before it fell, I believe the Soviet Union lost four submarines, with the assumption that they suffered the same mechanical failure. If, say, a half dozen of China’s best submarines all went bloop in just a few days, with no indication prior to a loud noise when they got too deep, there is little or nothing China could do, other than fret.
But it would do much to take them down a few pegs as far as willingness to engage in aggression.
“Those darned Krakens!”