Adelaide Metropolitan Waters
| Location | 15 km offshore from North Haven, Gulf St Vincent |
| Access | Boat dive from North Haven Boat Ramp |
| Depth | 18 metres |
| Difficulty | Intermediate |
| Activity | Scuba Diving |
| Region | Adelaide & Adelaide Hills |
| Accommodation | Camping, mid-range and premium options — See accommodation options |
| Vessel History | Built Port Adelaide 1879, sank c. 1910 |
| Wreck Condition | Nearly completely broken up, bow section recognisable |
Diving a Piece of Port Adelaide’s Maritime Heritage
Fifteen kilometres offshore from North Haven, resting in 18 metres of water in the outer shipping channel to Outer Harbour, lie the remains of the John Robb — a vessel built in Port Adelaide in 1879 that met its end during a storm around 1910. More than a century on the seabed has reduced the wreck to a shadow of its former self, but the bow section still rises recognisably from the sand, pointing west as if still trying to navigate the channel it once sailed through. For divers willing to make the journey offshore, the John Robb offers a unique combination of maritime history and marine ecology in Adelaide’s deeper metropolitan waters.
The John Robb is one of several historic wrecks in the waters off Adelaide that trace the city’s maritime heritage back to the nineteenth century, when Port Adelaide was one of the busiest ports in the southern hemisphere. Ships built in local yards plied the coastal trade, carrying goods between South Australian ports and interstate destinations. The storms and currents of Gulf St Vincent claimed many of these vessels, and their remains now serve as both historical records and artificial reefs supporting marine communities.
The Dive Experience
The wreck is now nearly completely broken up, with only the bow section remaining as a recognisable structure protruding from the sandy seabed. The scattered wreckage across the surrounding area creates multiple points of interest for divers — each fragment of timber and iron has become a substrate for marine growth and a shelter for fish and invertebrates. Marine life around the wreck varies from prolific to sparse depending on conditions and season, reflecting the dynamic nature of this offshore environment.
The site’s distance from shore — 15 kilometres — means visibility is generally better than at closer inshore sites, as the water is less affected by coastal runoff and sediment. However, the outer channel location also means the site is subject to tidal currents that can be strong, requiring divers to plan their entry around slack water periods. The intermediate rating reflects both the depth and the current considerations.
Planning Your Dive
Access is by boat from the North Haven boat ramp. The wreck is extremely difficult to locate using landmarks alone — reliable GPS coordinates are essential. The 18-metre depth and potential current make this a site for experienced recreational divers with good buoyancy control and current-diving skills. Standard open water certification is the minimum requirement, though advanced certification and experience in current diving are strongly recommended. The site pairs well with other offshore dive sites in the North Haven and Outer Harbour area.
The John Robb dive site is a journey into Adelaide’s maritime past — a wreck that has spent over a century transforming from a working vessel into a piece of underwater heritage. The bow section, still pointing west through the channel it once navigated, serves as a quiet monument to the era when Port Adelaide’s shipyards launched vessels into the waters that would eventually claim them.
Where to Stay
Planning an overnight trip? See our Adelaide Hills Accommodation Guide for the best places to stay near this trail.