

Slot Cave is a cavern and wall dive that rewards intermediate divers with both dramatic structure and patient macro hunting. The narrow cavern entrance opens into a passage draped in sponge gardens, and wobbegong sharks are a reliable find resting on the ledges inside. Visibility ranges from 10 to 30 metres, and depths run between 12 and 18 metres, keeping the dive well within recreational limits. Eastern blue devil fish hold territory along the wall, blue groper cruise the reef, and the rock surfaces offer nudibranchs, common octopus, and varied macro life for those who slow down and look closely. Surge and variable current can make the cavern entry demanding, so solid buoyancy control is important.
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Time your dive for slack water to minimise surge inside the cavern, as a swell can make the entrance tricky and stir up visibility. Bring a torch even if the cavern looks well-lit from outside, as the sponge gardens and resting wobbegongs in the darker sections are worth the extra effort.
The site is accessible via boat, typically from charter services operating out of Huskisson. The most common departure point is the Woollamia Boat Ramp. The site should only be dived in calm conditions with little to no swell.
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The primary hazard is swell; this site should only be attempted in little to no swell conditions. While it is a cavern with constant light access, divers should be comfortable with overhead environments.
Depth
12-18m
Visibility
10-30m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
14-22°C
Current
None
Typical Dive
50 min
Best Time
Year-round
Slot Cave in New South Wales is known for wobbegong sharks, eastern blue devil fish, and blue groper. The site also features sponge gardens, common octopus, diverse nudibranchs, and abundant macro life making it excellent for underwater photography.
Slot Cave near Huskisson reaches depths between 12 and 18 metres. The site is an intermediate level dive with an overhead environment requiring appropriate training and experience.
Divers need an Advanced Open Water certification to dive Slot Cave due to the overhead environment and intermediate skill requirements. The site features an overhead structure with potential surge conditions that demand advanced training.
Slot Cave requires boat access and cannot be reached from shore. Parking facilities are available at the departure point near Huskisson for dive boat operations.
The best months to dive Slot Cave are January through August, covering summer through winter. Water temperatures range from 14 to 22 degrees Celsius, with visibility between 10 and 30 metres throughout this period.
Slot Cave presents two main hazards: the overhead environment and surge conditions. Divers must have Advanced Open Water certification and experience managing overhead spaces where direct ascent may not be possible.
Night diving is permitted at Slot Cave, offering opportunities to observe nocturnal marine life including wobbegong sharks and octopus. The overhead environment requires careful navigation and appropriate night diving experience at the Advanced Open Water level.
There is no entry fee to dive Slot Cave. Costs are limited to boat charter fees from Huskisson, as the site requires boat access and cannot be reached from shore.
Slot Cave in Huskisson is best suited for divers with some experience. You should be comfortable with your buoyancy and have logged at least 10 to 20 dives.
A 7mm wetsuit or semi-dry is recommended for diving at Slot Cave in Huskisson. Water temperatures range from 14°C to 22°C.