Ulladulla Harbour is the working fishing port at the centre of the town, enclosed by a rock breakwall that protects the boat ramp and fishing fleet. It is not a destination dive in its own right, but local divers and the dive shop use it as a sheltered training and night-dive site when the open coast is too rough. The water is shallow, typically 2–8 m, with sand, rubble and the rock face of the breakwall, as well as wharf pylons and moorings.

The harbour and breakwall support a surprising amount of life for a port. Octopus, cuttlefish and a variety of nudibranchs live in the rocks and rubble; stingrays, fiddler rays and flathead are found on the sand; and bream, luderick, leatherjackets and schools of small baitfish gather around the wharf structures. At night there are shrimps, crabs, squid and sleeping fish. The fishing fleet also attracts rays and occasionally seals looking for scraps.

The harbour is an active port, so boat traffic is the main issue. Divers need to keep well away from the boat ramp and channel, use a dive flag, and ideally dive with the local shop, which knows the accepted entry points and quieter times. Visibility is usually poor, so this is best seen as a sheltered option for training, skills and macro rather than scenery. Detailed published information on the harbour as a dive site is limited. Its value is as a place to get wet when the ocean is closed, to practise skills in calm water, or to see octopus and squid on a night dive a few minutes from the dive shop.

The harbour is in the middle of Ulladulla, directly off the Princes Highway; turn east at the harbour and park near the boat ramp or the grassed foreshore. Divers enter from the small harbour beach or the rocks at the inner end of the breakwall, well away from the ramp and the working fishing wharf. Harbour use and entry points should be checked with the dive shop and harbour authorities first, as the wharves are active.

The breakwall shelters the harbour from most swell, so it can be used when everything outside is too rough, although a strong easterly swell can wrap into the entrance. Visibility is often poor, especially after rain, in strong winds or after heavy boat traffic, and is best on an incoming tide after calm weather. Night dives are best on calm nights in the inner harbour away from the channel.

Enter from the inner harbour, follow the base of the breakwall rocks at 3–6 m and work slowly along the rock–sand edge looking for macro life, staying well clear of the boat channel and ramp. Turn at half gas and retrace.

Used by Dive Adventures Ulladulla for training and guided shore/night dives when the open coast is rough. No scheduled independent diving; check with the shop and harbour authorities.