Double Decker Cave is a spectacular two-tiered sea cave and swim-through located off the southern headland of Jervis Bay on the NSW South Coast. Part of the renowned "Docks" dive site, this unique sandstone formation features a lower chamber and an upper chamber, allowing snorkellers and divers to glide through both levels. The cave is adorned with vibrant sponge gardens, gorgonian fans, and colourful soft corals clinging to the walls. Inside, shafts of light filter through the entrances, illuminating schools of Old Wives and the occasional elusive Eastern Blue Devil. The site is sheltered from prevailing winds and offers an otherworldly, cathedral-like underwater experience.
Double Decker Cave
IntermediateMAYBE
MAYBE
Fair. Experienced snorkellers only.
Showing last known conditions
Wave Height 0.1 mSwell Period 8.8 sWind Speed 1.4 knPrecipitation 24 mmTidal Phase slack
Last evaluated
The spot
Community-maintained
Community contribution: submitted by Daniel
Know before you go
Logged by the community, confirmed by mods
Moderate risk: Surge in cave passages
Ocean swell can create strong surge through the cave's narrow swim-through chambers, which can push snorkellers against rocks.
Moderate risk: Confined spaces / cavern
The vertical swim-through leads into a cavern with limited exit options. Not suitable for those uncomfortable with enclosed spaces.
Low risk: Boat traffic
The site is accessed by boat and is near the main Jervis Bay shipping channel; be aware of vessel movements on the surface.
Low risk: Variable visibility
Wind and swell can stir up sediment, reducing visibility significantly — the site is best in calm conditions.
Low risk: Cold water thermocline
Temperate NSW waters can have sharp thermoclines; water temps may drop suddenly in deeper sections (12-18°C in winter).
Low risk: Swell surge inside cavern
Swell can push snorkelers/divers against walls inside the swim-through and cavern, especially on days with larger ocean swells.
Low risk: Sharp reef edges
The rocky reef surrounding the entrance has sharp edges and sea urchins. Care required when entering and exiting.
Wildlife Guide
No wildlife notes for this spot yet.
Gallery
Be the first to share a photo
No photos yet — yours could be the first.
Photos are reviewed by moderators before they appear.
Getting in
Boat
Entry
Double Decker Cave is part of The Docks dive site on the southern side of Jervis Bay, near Point Perpendicular. Access is by private boat or commercial charter from the Jervis Bay region (departing from Currarong or Huskisson). The site is approximately 2-3 km offshore from the southern headland. No shore entry is possible — the cave is only accessible via boat.
Parking & facilities
Parking available at Currarong boat ramp or Huskisson wharf areas, depending on charter operator.
parkingtoilets
Charter dive trips typically cost $120–$180 per person. No fees for private boat access.
Spot Map
Community
Trust
Is this spot real, accurate, still loved?
Spots near New South Wales
No nearby spots yet.
Needs verification
Quick verify
One tap helps the community keep this spot honest.
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