Meet the site
The SS Commonwealth is a small wooden steamer wreck that has an unusual place in Terrigal diving history. Built in 1901, she was a 36.7 m, 188-ton wooden cargo steamer, and on 19 August 1916 she foundered off Terrigal while carrying coal from Lake Macquarie to Botany Bay, according to Muddy Puddle Diver's wreck notes. COAST Magazine places her at Foggy Reef off Bateau Bay and lists her as an active dive site. Her main legacy for local divers is indirect. Muddy Puddle Diver records that Foggy Cave - now the centrepiece of Terrigal diving and a well-known grey nurse shark aggregation site - was discovered by Les and Fran Graham in the 1970s while they were searching for the wreck of the Commonwealth. The wreck itself is typical of a wooden steamer after a century on the seabed. The timber hull has largely gone, leaving the durable machinery. The Marine Life Network notes two boilers, two engines and lots of copper rivets visible - so the machinery stands as the main structure with a scatter of fastenings and fittings in the sand around it. The Terrigal Underwater Group lists the depth at 42 m, the Marine Life Network at 37 m. As with other Terrigal deep sites, the machinery attracts fish: yellowtail and bullseyes around the boilers, wobbegongs among the debris, and the possibility of grey nurse sharks from the nearby Foggy Reef aggregation during warmer months. Sponges and small gorgonians grow on the boilers. At 37-42 m the dive involves decompression for most profiles and is for trained deep or technical divers. It appeals to those interested in local history and in the Foggy Reef system - and it is the wreck that led to Terrigal's best reef dive.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
SS Commonwealth wreck (Foggy Reef) is recorded as Wreck in Central Coast. The listed access is boat. Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Topics flagged by the stored research
These are questions prompted by the existing notes, not a verified or complete hazard assessment.
- Current and timing
- Ask how the operator assesses the current window for the actual route. Historical tide notes are not a departure instruction.
- Lines and obstructions
- Discuss any known entanglement concerns and the suitability of the planned area.
- Planned depth
- Confirm the intended route and training requirements; the recorded maximum is not a target.
- Overhead environments
- Ask whether the plan stays entirely in open water. A wreck or cave listing is not permission or training to enter.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is SS Commonwealth wreck (Foggy Reef) suitable for my certification?
The record lists Technical (decompression). That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book SS Commonwealth wreck (Foggy Reef) through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Yellowtail, bullseyes, wobbegong sharks, sponges, small gorgonians, occasional grey nurse sharks (nearby Foggy Reef aggregation)
Location
Remains of a 1901 wooden steamer that foundered off Foggy Reef, Bateau Bay, in 1916, lying in about 37-42 m.
Facilities nearby
Departs Terrigal Haven: paid parking, toilets, kiosk and dive shop.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
muddypuddlediver.comterrigalunderwatergroup.commarinelife.org.aucoastmagazine.com.aumuddypuddlediver.comRecord updated 26 Sept 2026. Source claims are being reviewed.