Marty's Cave is an offshore swim-through cave in the crystal-clear waters of Jurien Bay Marine Park on Western Australia's Coral Coast. Unlike a true enclosed cavern, this limestone formation creates a dramatic tunnel beneath the seabed — like a natural stadium passage — where shafts of sunlight pierce through openings above. Divers and snorkellers glide through the cavern while schooling fish flit past the walls. The site sits within the Jurien Bay Marine Park, renowned for its resident Australian sea lion colony and vibrant reef ecosystems, making Marty's Cave a unique geological and marine highlight of the region.
Marty's Cave
IntermediateSKIP
SKIP
Poor conditions. Stay out today.
Showing last known conditions
Wave Height 2.0 mSwell Period 11 sWind Speed 2.6 knPrecipitation 2.5 mmTidal Phase ebb
Last evaluated
The spot
Community-maintained
Community contribution: submitted by Daniel
Know before you go
Logged by the community, confirmed by mods
Moderate risk: Enclosed swim-through
The cave is a tunnel-like swim-through with limited overhead clearance; snorkellers must be comfortable in enclosed spaces and should not enter if claustrophobic.
Low risk: Surge and swell inside cave
Swell can push snorkellers into rock walls inside the cave. Calm conditions recommended.
Low risk: Strong currents outside cave
Offshore currents in Jurien Bay can be strong, especially during tidal exchanges. Swim with a buddy and check conditions before entering.
Low risk: Boat traffic
The site is accessed by boat and located near marine park transit routes. Watch for vessels when surfacing.
Wildlife Guide
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Getting in
Boat
Entry
Marty's Cave is located offshore in Jurien Bay Marine Park, approximately 2 km west of Jurien Bay beach. Access is by private boat or via guided snorkel/dive tours departing from Jurien Bay Boat Harbour. The site is not accessible from shore.
Parking & facilities
Parking available at Jurien Bay Boat Harbour car park, Grigson Street, Jurien Bay.
parkingtoilets
No fee for private boat access. Guided snorkel tours range from $100-$150 per person.
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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