HMAS J4 Submarine Suggest edit

The HMAS J4 Submarine is a historic dive site located in Port Phillip Bay, Melbourne, Victoria. This decommissioned submarine offers divers a unique opportunity to explore a significant piece of naval history while enjoying the marine life that has made it their home.

Divers can explore the exterior and interior of the submarine, which rests upright on the seabed. The site is known for its diverse marine life, including various fish species and invertebrates that inhabit the structure. The dive can be both an exploration of history and a chance to observe marine ecosystems.

• Visibility: 5.0–15.0 m Suggest edit
• Currents: Mild Suggest edit
• Surge: Moderate Suggest edit
• Water temp (summer): 16.0–22.0 °C Suggest edit
• Water temp (winter): 10.0–14.0 °C Suggest edit

• Entry: Boat Suggest edit
• Permits required: Yes
  A diving permit is required for access to the site.
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• Bottom types:
  sand rubble artificial reef Suggest edit