Investigator Marine Park offers a genuinely diverse dive across reef, wall, kelp forest, and cave environments in the cold, productive waters of South Australia. Depths run from the shallows down to 70 metres, putting much of the site firmly in deep diving territory, so plan your gas and bottom time accordingly. Visibility is variable, which is worth factoring into your dive plan. Moderate to strong currents are common. The marine life here is a highlight of temperate Australian diving, with Australian sea lions and New Zealand fur seals adding real energy to dives, alongside harlequin fish, southern blue devil, western blue groper, golden roughy, gorgonian corals, soft corals, rock lobster, and abalone.
-33.96170, 134.27500
The site dives best between June and October when water clarity tends to improve and sea lion activity peaks. Cold water is a constant here year-round, so a well-fitting drysuit or a thick wetsuit with hood and gloves is not optional.
Access to the Investigator Marine Park offshore islands, including Pearson Island, is by boat, typically via charter from towns on the Eyre Peninsula like Elliston.
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Great white sharks are known to visit the area to feed on the seal colonies. The offshore location means conditions can change and become hazardous.
Depth
0-50m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
18-23°C
Current
Moderate
Best Time
Jun, Jul, Aug, Sep, Oct
Investigator Marine Park in South Australia requires boat access from the Eyre Peninsula, as there is no shore entry available. The remote location off South Australia's coast means all visits must be arranged through commercial operators with suitable vessels for offshore conditions. No facilities exist at the site, so visitors must be completely self-sufficient for the duration of their trip.
Investigator Marine Park hosts diverse marine life including Australian sea lions and New Zealand fur seals, along with unique fish species such as harlequin fish, southern blue devil, and golden roughy. The rocky reefs support abundant invertebrates including rock lobster and abalone, whilst soft corals colonise the underwater structures. The cooler southern waters create habitat for species rarely seen in warmer Australian locations.
Water temperatures at Investigator Marine Park range from 15°C to 21°C throughout the year, requiring thermal protection for snorkelling. The coldest conditions occur outside the winter-to-spring optimal visiting period, whilst the warmest waters of around 21°C typically occur during the recommended months of June through October. A quality wetsuit of at least 5mm thickness is essential for extended time in the water.
The optimal months for visiting Investigator Marine Park are June through October, covering the Australian winter and early spring period. These months offer the best combination of marine life activity and weather conditions suitable for boat operations in this exposed offshore location. Winter months provide excellent opportunities to observe seals and other cold-water species at their most active.
Investigator Marine Park requires intermediate snorkelling skills due to moderate currents, surge conditions, and cold water temperatures. The remote offshore location means snorkellers must be confident in open water, capable of managing themselves in choppy conditions, and comfortable with boat entries and exits. Advanced dive certification is required for any diving activities at the site, reflecting the challenging environment.
Investigator Marine Park presents multiple hazards including moderate to strong currents, cold water, surge conditions, and significant boat traffic from commercial operators. The site reaches depths of 70 metres in surrounding areas, creating potential downcurrents, whilst marine life interactions with seals and sea lions require respectful distance. The exposed offshore location means conditions can deteriorate rapidly, requiring constant weather monitoring.
Investigator Marine Park has no entry fee for the marine protected area itself, as it is a public conservation zone. However, visitors must arrange commercial boat transport from the Eyre Peninsula, which involves operator fees for vessel charter, guides, and equipment. The remote location means trip costs are substantial due to the distance travelled and specialised vessels required.
Diving at Investigator Marine Park in Eyre Peninsula requires the following certifications: Advanced. Always dive within your training limits.
A 5mm wetsuit is recommended for diving at Investigator Marine Park in Eyre Peninsula. Water temperatures range from 18°C to 23°C.
Investigator Marine Park in Eyre Peninsula has a maximum depth of 50 metres.
