Old Aquarium

High risk: White water conditions

If white water is visible from shore, conditions are unsafe — do not enter.

Moderate risk: Swell and Surge

The site is exposed to Southern Ocean swells. Large wave surge can occur around the breakwater and over the reef, especially during westerly winds.

Moderate risk: Southern Ocean swell and surge

The site faces south into the Southern Ocean and is prone to strong surge and large swells, especially on high swell days.

Moderate risk: Swell surge on breakwater

Southern Ocean swells can wrap around the breakwater, creating sudden surge and strong wash near the concrete domes and submerged ruins.

Low risk: Strong Currents

Tidal currents can run strongly along the breakwater, particularly on outgoing tides. Snorkellers should be aware of changing conditions.

Low risk: Uneven Rocky Substrate

Entry and exit is over rocks and boulders. Slippery, uneven surfaces with sharp edges require sturdy foot protection.

Low risk: Cold Water Temperatures

Water temperatures in this region range from 11–17°C year-round, requiring a thick wetsuit for comfortable snorkelling.

Low risk: Rugged rock entry and exit

Entry is over rocks onto a reef platform. Slippery and sharp terrain requires care, especially when exiting in surf.

Low risk: Outgoing tide current

Tidal movement around the breakwater and Middle Reef can create currents; best dived at low tide.

Low risk: Sharp submerged debris

Remnants of the aquarium structure — exposed rebar, broken concrete, and sandstone blocks — can cause cuts and scrapes.

Low risk: Changing tide currents

Tidal flows through the breakwater and around the reef can create unpredictable currents, especially on an outgoing tide.

Low risk: Sharp rocks and reef platform

Entry and exit is over rocks onto a reef platform — slippery and sharp when exiting.