

The HMAS J3 is a decommissioned Royal Australian Navy submarine resting in easy shallow waters off Victoria, making it an accessible wreck dive for beginners. At 5 to 8 metres depth, you can take your time exploring the hull, which is now colonised by sponges and draped in kelp. Blue devilfish are a highlight here, often tucked into crevices along the structure. Visibility runs from 5 to 10 metres, though currents can be strong, so check conditions before entering the water. Entry is by boat only, and timing your dive around slack water will make a real difference to your experience.
-38.24405, 144.70300
This site dives best from December through May when conditions are generally more settled. Plan your dive around slack tide to avoid the strong currents, and confirm current boat charter availability and facilities locally before heading out.
**ACCESS PROHIBITED**: The wreck is located within the Prohibited Area of the Swan Island Department of Defence facility. Diving the site is considered out of bounds. While it was dived in the past, access is no longer permitted.
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The primary hazard is the strong current. The site is also within a prohibited military zone, and access is not allowed.
Depth
5-8m
Visibility
5-10m
Skill Level
Beginner
Entry
Boat
Boat required
Water Temp
20-29°C
Current
Strong
Typical Dive
40 min
Best Time
Jan, Feb, Mar, Apr, May, Dec
Yes, HMAS J3 Submarine in Melbourne is a boat-access-only dive site. You will need to book with a local dive operator or charter a boat to reach it.
HMAS J3 Submarine in Melbourne is well-suited for beginner divers and snorkellers. Conditions are typically calm with easy entry and shallow depths.
Diving at HMAS J3 Submarine in Melbourne requires the following certifications: Open Water. Always dive within your training limits.
A 3mm wetsuit is recommended for diving at HMAS J3 Submarine in Melbourne. Water temperatures range from 20°C to 29°C.
HMAS J3 Submarine in Melbourne is home to blue devilfish, sponges, and kelp. Marine life sightings vary by season and conditions.
The best months to visit HMAS J3 Submarine in Melbourne are December, January, February, March, April, and May. Conditions outside these months can still be good but are less predictable.
HMAS J3 Submarine in Melbourne has depths ranging from 5 metres to 8 metres.
A typical dive at HMAS J3 Submarine in Melbourne lasts approximately 40 minutes. Actual dive time depends on depth, air consumption, and conditions.
HMAS J3 Submarine in Melbourne can have strong currents. Advanced experience with drift diving and current navigation is recommended.
Visibility at HMAS J3 Submarine in Melbourne typically ranges from 5 metres to 10 metres. Conditions vary with weather, tides, and seasons.