Presumably, it was carried out by uncrewed naval vessels.

In the area of the Sochi seaport on the morning of September 3 — plumes of smoke. Local residents reported explosions, and monitoring channels reported a probable attack by Ukrainian uncrewed naval vessels.
The Exilenova+ channel writes that the probable target of the attack was a vessel used for servicing offshore oil and gas operations.
Overnight, Russian authorities declared a drone attack threat in Sochi, Gelendzhik, Novorossiysk, and other coastal areas. From 1:22 AM to 5:04 AM, Sochi and Gelendzhik airports did not accept or dispatch aircraft, local media reported.
Russian authorities have not reported any damage to the port or possible casualties. The Ukrainian side has not yet commented on the attack.
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