

Best for beginner divers, 5-20m, boat entry, moderate current.
Alden's Cave at Flinders Reef provides an accessible cavern diving experience suitable for beginners. The site features a spacious swim-through cavern with multiple openings, situated at depths between 5 and 20 metres. Divers can expect visibility ranging from 7 to 16 metres. The eastern side of the reef is exposed to weather, which can generate surge and moderate currents. Access is by boat only, with a typical dive duration of 50 minutes. Divers should remain cautious of boat traffic on the surface and manage buoyancy carefully near the cavern walls. Water temperatures fluctuate between 21C and 27C throughout the year.
-26.97858, 153.48583
April through November brings the most settled conditions at Flinders Reef, so plan your trip within that window if you can. Be aware of boat traffic on the surface before you ascend and always do a safety stop, as surge near the cavern entrance can catch new divers off guard.
The site is accessible via boat charter from Mooloolaba. Operators like Scuba World and Sunreef depart from the marina at The Wharf Mooloolaba (123 Parkyn Parade). The boat ride is approximately 45 minutes.
Recorded at this site
Depth
5-20m
Visibility
7-16m
Skill Level
Beginner
Entry
Boat
Boat required
Water Temp
21-27°C
Current
Moderate
Typical Dive
50 min
Best Time
Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
Yes, the site is designed to offer an introduction to cavern diving for beginners, though divers should be prepared for moderate currents and surge.
The site features depths ranging from 5 to 20 metres.
Access to Alden's Cave is by boat only, requiring a boat charter from the mainland.
The most settled conditions occur between April and November.
Hazards include boat traffic, strong currents, surge, and the presence of whaler sharks.
Diving at Alden's Cave in Mooloolaba requires the following certifications: Open Water. Always dive within your training limits.
Yes, equipment rental is available at or near Alden's Cave in Mooloolaba. Contact local dive operators for specific gear availability and prices.
A 3mm wetsuit is recommended for diving at Alden's Cave in Mooloolaba. Water temperatures range from 21°C to 27°C.
Expect moderate currents at Alden's Cave in Mooloolaba. Good buoyancy control and some drift diving experience is helpful.
Visibility at Alden's Cave in Mooloolaba typically ranges from 7 metres to 16 metres. Conditions vary with weather, tides, and seasons.