Cape Liptrap is a remote rocky headland in South Gippsland, jutting south into Bass Strait between Waratah Bay and Venus Bay. Reef diving runs out to around 20 m and the site is rarely dived — getting there takes effort and conditions need to line up. When it does fire it's exceptional: dense kelp gardens, sponge cover, crayfish, abalone, weedy seadragons, blue devils and the occasional pelagic visitor cruising the cape's deeper edges. Boat access is the only practical way in, launched from Walkerville or further afield. Best in light north-east winds, swell under a metre and tide near slack. Use the live 7-day wind and swell forecast on this page to find your day. Advanced divers only — exposed coast, current around the cape, remote location with limited bail-out, plan a properly flat window before you commit to the trip out.
How far you can see underwater — measured in metres. 10m+ is great, 5–10m is workable, under 3m is murk. Driven by wind, swell, and recent rain.
Long-period waves rolling in from the open ocean. Direction matters more than height — a S swell hits Portsea hard, but an E swell rolls past. Period over 12 s = real ocean punch.
Offshore (N or NE) flattens the surface and clears the water. Onshore (SE through SW) chops it up and stirs sand. Calm or light offshore is the magic combo.
This site faces the open ocean. The exposure caption above shows which directions slam in. Anything from the opposite side gets blocked — that's the safest window.
Slack water — the 30 minutes either side of high or low — is calmest and clearest. Mid-tide brings the most flow. Plan to be down at slack, up before the run picks up.
Bass Strait sits 14–16 °C autumn–winter, 17–19 °C summer. Below 16° a 7 mm hooded keeps you warm for 60 min+. Drysuit if you're going long.