Slot Cave is an enchanting sea cavern tucked along the Jervis Bay coastline in Booderee National Park on the NSW South Coast. More of a well-lit tunnel than a pitch-black cave, it runs straight through the rock with a sandy bottom at 12–14 m depth, gradually shallowing toward the back where you ascend to the surface. Coral gardens and sponge-covered walls teem with macro life in every crack, and the cavern remains surprisingly clear even when outside visibility drops. Drifting out the far side, you can follow the rock wall to Double Decker Cave or explore deeper sponge gardens rich with nudibranchs, wobbegongs, and eastern blue devil fish.
Slot Cave
IntermediateMAYBE
MAYBE
Fair. Experienced snorkellers only.
Showing last known conditions
Wave Height 0.5 mSwell Period 9.3 sWind Speed 1.8 knPrecipitation 24 mmTidal Phase slack
Last evaluated
The spot
Community-maintained
Community contribution: submitted by Daniel
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Moderate risk: Swell surge inside cave
Slot Cave requires northerly winds and low swell; southerly swells can create surge and dangerous conditions inside the narrow passage.
Low risk: Depth transition
Depth drops to 12–14 m at the entrance with a gradual shallowing toward the back — divers must monitor depth and ascent.
Low risk: Confined space navigation
The narrow cave passage requires good buoyancy control and a torch; silt can be stirred up reducing visibility inside.
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Getting in
Boat
Entry
Slot Cave is accessible by boat from Jervis Bay, NSW South Coast. The site lies off the Booderee National Park coastline. Most divers launch from boat ramps in Huskisson or nearby and motor to the cave site. GPS coordinates: -35.08065, 150.79483.
Parking & facilities
Parking available at public boat ramps in Huskisson (e.g., the boat harbour) or at Greenfield Beach car park. A national park entry fee may apply for Booderee National Park.
parkingboat_ramp
Boat ramp access is free; Booderee National Park day entry fee applies if accessing via the park (approx. AUD 13 per vehicle).
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About this data
- Conditions last evaluated
- Spot data last updated
- Data sources
- Open-Meteo (marine & weather conditions), tide predictions via UTide, community contributors (descriptions, hazards, marine life).
- License
- Spot content licensed under CC BY-SA 4.0. How's the Spot is open source.
Weather & swell ┬╖ Open-Meteo marine & weather APIs Tides ┬╖ UTide harmonic analysis Sea & safety ┬╖ community reports