The Milora is a deep Bass Strait wreck sitting in around 75 m off the Mornington Peninsula's south coast, again well into technical-diving territory. She's an older wreck with thick marine growth — sponges, ascidians, schools of bullseyes and bigger pelagics passing through — and vis can be exceptional in the right conditions. Mixed-gas, full deco, twin sets and serious tech training are non-negotiable here. Boat-only access via charter operators who run tech trips out of the bay or down the peninsula coast. Conditions need to be properly settled: light north-east winds, swell under 1 m, tide near slack so the surface interval and shot line stay calm. Use the live 7-day wind and swell forecast on this page to spot a flat-water window. Technical divers only — 75 m, full deco, gas-mixing, plenty of bottom planning, no recreational equivalent.
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.