Sonar is a brilliant beacon identifying the subs location; other than in combat where they are already detected or desperately need a hard fix on a target now, or someplace they don’t need to be stealthy, subs aren’t using it.

AFAIK, the first sub-deployed gravity gradiometers were developed for the Ohio-class ballistic missile subs and Los Angeles-class attack subs like San Francisco don’t, AFAIK, have them.