

Best for advanced divers, 12-40m, boat entry, strong current.
The Cavern at Big Seal Rock is an advanced dive site featuring a dramatic wall that drops from 12 metres to a cavern entrance at 30 metres. This overhead environment requires technical proficiency, including solid buoyancy control and experience with deep and drift diving. The site is exposed to the East Australian Current, which can create strong currents and surge. Visibility varies significantly, ranging from 0 to 30 metres. Due to the depth, overhead sections, and potential for strong currents, this site is suited for experienced divers. A surface marker buoy is mandatory due to heavy boat traffic in the area, and a torch is essential for exploring the cavern interior.
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Time your dive around slack water if possible, as the strong current can make the cavern entrance genuinely hazardous at full run. A torch is essential inside the overhead sections, and a surface marker buoy is mandatory given the boat traffic in the area.
The site is an offshore reef accessible only by boat. Dive charters operate from nearby towns, primarily Forster.
Recorded at this site
Depth
12-40m
Visibility
0-30m
Skill Level
Advanced
Entry
Boat
Boat required
Water Temp
19-23°C
Current
Strong
Typical Dive
45 min
Best Time
Year-round
The site is a known aggregation area for Grey Nurse Sharks. Other species recorded at the site include wobbegong sharks, kingfish, black cod, stingrays, and turtles.
No, this site is for advanced divers only. It requires experience with deep diving, overhead environments, and managing strong currents.
The site ranges from 12 to 40 metres, with an average depth of 21 metres.
This is a boat dive located 3700 metres from the shore. Boat access is required.
While the site has a snorkel rating of 3/5, the depth and strong currents make it primarily a location for experienced divers.
The site can be dived year-round, with conditions suitable from January through December.
Diving at The Cavern in Smiths Lake requires the following certifications: Advanced. Always dive within your training limits.
A 5mm wetsuit is recommended for diving at The Cavern in Smiths Lake. Water temperatures range from 19°C to 23°C.
Divers at The Cavern in Smiths Lake should be aware of sharks. These encounters are generally rare and avoidable with proper awareness. Follow local safety guidance and maintain a respectful distance from all marine life.
The Cavern in Smiths Lake can have strong currents. Advanced experience with drift diving and current navigation is recommended.
Visibility at The Cavern in Smiths Lake can reach up to 30 metres. Conditions vary with weather, tides, and seasons.