Offshore Barwon Heads on the Surf Coast sits in around 18 m of Bass Strait water, with a mix of natural granite reef and the artificial reef created by the Ships' Graveyard scuttlings. The reef holds crayfish, abalone, weedy seadragons, blue devils, big snapper, banjo sharks, schools of bullseyes and sweep, and the wreck sites pull in pelagics. It's all boat-access — launching from the Barwon Heads ramp, Ocean Grove ramp or running round from Queenscliff. Best in light north-east winds with swell under 1.5 m and tide near slack so current is manageable on the offshore reefs. Use the live 7-day wind and swell forecast on this page to find a flat day. Advanced divers — exposed Bass Strait, current on tide change, several kilometres offshore so you need a proper boat and plan, plus full wreck training if you're heading for the scuttled vessels.
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.