This sea cave is located near Luscomb's Point in San Diego's Sunset Cliffs area and it is an impressive spot to explore along the coast. The cave is only accessible at a low negative tide (I went at -.8) and I would not recommend you go if it is not at least a -1 low tide (tide schedule https://magicseaweed.com/Sunset-Cliffs-Surf-Report/4211/Tide/). It's a short easy hike from the point along the coast to the cave if the tide is out.
Read more at https://californiathroughmylens.com/sunset-cliffs-open-ceiling-sea-cave/ and at http://lastadventurer.com/last-adventurers-fieldnotes/sunsetcliffsseacave
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