Castle Rock

Moderate risk: Strong south-westerly swells

Exposed to powerful swells from the Southern Ocean via Bass Strait, which can create dangerous surf conditions suddenly.

Moderate risk: Strong currents and undertows

Tidal currents and undertows can be strong when snorkeling near the rock platforms, especially during outgoing tides.

Moderate risk: Large unexpected waves

Sneaker waves can wash over rock platforms without warning, posing a risk to snorkelers and rockpoolers near the water's edge.

Moderate risk: Strong tidal currents at Port Phillip Heads

Sweeping currents around the heads can be powerful, especially on outgoing tides, requiring good fitness and awareness.

Moderate risk: Boat traffic

Located in a shipping channel approach with regular vessel traffic; snorkellers must stay vigilant and use a surface marker buoy.

Low risk: Sudden weather changes

Weather conditions can shift rapidly along this exposed coastline, with increased wind and wave height developing quickly.

Low risk: Slippery rock platforms

Intertidal sandstone rock platforms are often wet and covered with algae, creating very slippery walking conditions.

Low risk: Cold water temperatures

Temperate waters range from 10–18°C year-round, posing a risk of hypothermia without proper exposure protection.

Low risk: Variable visibility

Visibility can change rapidly from excellent (15m+) to poor (2-3m) due to swell and tide shifts.