I've looked at this several times, and for quite an extended few moments each time. I can't quite decide if it's naturally-lying rocks and fog (which I'd love), or a breakwater made of rocks with water vaporized by an extended exposure (which I'd tolerate). Alas, I think it may be the latter, but that doesn't stop it from being really very beautiful.
A welcome different approach of this kind of shot (water, rocks, long exposure). The composition is simple but superb, well helped by a perfect exposure and beautiful tones