Shark diving is carried out at North Neptune Islands, which are situated at the mouth of the Spencer Gulf, south of Port Lincoln (35°14’S, 136° 04’E). The sea surface temperature ranges from 13-22°C (57-72°F), the water visibility can be up to 20m close in and the average depth wider around the islands is 30-50m.

• You can see the larger Island  "North Neptune west” and  the smaller  island “North Neptune East”
  
  
• The main bay is where we spend most of our winter trips, away from the prevailing westerly wind, and where the seals get protection from the weather. It is shallow enough for easy submersible bottom diving. Most diving is in 12-18 metres.
  
  
• “Crystal’s crack” is the crevasse we go into for most island shore parties is the western most one on the NN east island. Shore parties on the Main Island normally step off in the main bay
  
  
• Rarely do we anchor along the high cliffs of the western side of the main island as the swells here are generally too big to make cage diving possible.
  
  
• “The drop off” is a steep, underwater, rocky slope, 12-22 metres depth, that gives us a contrast of underwater scenery to the flat sandy/weedy bottom in the middle of the main bay.
  
  
• Action Bay is the best bottom diving location on the northern side. In the middle of Action Bay, a large saddle of rock runs out into deep water, and is home to thousands of colourful reef fish.  This makes a beautiful back drop to the cruising sharks, which seem to like visiting us in this location.
  
  
• “Guy’s knob” is the only pinnacle on the northern side of the eastern island that allows us to get our cage onto the bottom. Very light easterly winds with low swell are required to safely anchor this close to the rocks.
  
  
• The western side is open to the prevailing westerly swell, and only on very low swell days and easterly winds (mostly summer) is this a workable location.  We also need to locate very tightly in to the Western Crevasse to get a shallow bottom (less than 25 metres) for any bottom dives.