Diving & Travel Guide to South Australia – Whyalla

Whyalla, a coastal industrial city on the upper Spencer Gulf, is one of South Australia's most unique and extraordinary diving destinations, world-renowned for the annual spawning aggregation of the giant Australian cuttlefish (Sepia apama) – the largest cuttlefish in the world. Each year from May to August, thousands of giant cuttlefish congregate in the shallow rocky reefs of Stony Point and Black Point near Whyalla to mate and spawn in one of the most spectacular marine events in Australia. The cuttlefish display extraordinary color-changing abilities and complex mating behaviors, with males competing for females using elaborate body patterns and color displays. The aggregation at Stony Point is protected within the Whyalla Cuttlefish Sanctuary Zone, and the diving is accessible from shore with depths of only 2-6 meters, making it one of the most accessible and photographer-friendly marine wildlife encounters in Australia. Beyond the cuttlefish spawning, Whyalla offers diving at the historic HMAS Hobart scuttling site (the Ex-HMAS Protector), the Whyalla Jetty with diverse marine life, and the offshore reefs of the upper Spencer Gulf. The town of Whyalla provides practical facilities, accommodation, and dining, while the surrounding Spencer Gulf coastline offers additional diving and wildlife experiences including dolphin encounters and sea lion colonies. This natural event is so unique that it has been described as the 'Premier League' of marine mating displays, drawing scientists and nature documentary crews from around the world. The visibility in the upper gulf can be variable, but during the peak winter months, the water is often clear enough to see the sheer scale of the aggregation from the surface. For the diver, being surrounded by hundreds of pulsing, color-shifting cephalopods in just a few meters of water is an experience that is both surreal and deeply memorable.