Lake Bullen Merri is a volcanic crater lake that drops away sharply from shore, offering wall and drop-off diving in an unusual freshwater environment. Depths run from 3 to 50 metres, putting serious bottom time firmly in deep diving territory. Visibility swings considerably, anywhere from 3 to 20 metres depending on conditions, so pick your timing carefully. The lake is stocked with fish, giving you some wildlife interest on the way down. Currents are variable, and the cold water combined with depth means nitrogen narcosis is a real consideration. This is a solid site for intermediate divers who want to practise wall and deep diving without heading offshore.

Port Campbell Bay Reef is a sheltered shore dive sitting in easy shallow waters down to 9 metres, making it a comfortable choice for beginners building confidence. Visibility varies quite a bit, anywhere from 3 to 20 metres depending on conditions, so calm days reward you with clear water and good viewing. The reef and wall structure gives you interesting terrain to explore slowly, and if you take your time you will find nudibranchs, crayfish, and abalone tucked into crevices. Juvenile fish are common throughout, and eagle rays and smooth rays visit the area. Watch for variable currents and surge near the wall, and always check for boat traffic before surfacing.

The Arches Marine Sanctuary is a complex site built around a series of canyon cuts, caverns and arches running through the reef structure, accessed by boat off Victoria's coast. Depths run from 19 to 25 metres in the deeper sections, and visibility is genuinely variable, so plan around conditions rather than expectations. Strong current is a constant factor and surge can make cavern work unpredictable. Kelp, sponges, and sea-fans cover the structure, while gorgonians colonise the deeper walls. Port Jackson sharks and seals are regular sights, and abalone, sea urchins, and sea stars occupy the rocky substrate throughout.