

Leah Lumps is a wall and reef dive that drops into serious deep diving territory, running from 30 to 42 metres with visibility ranging from 10 to 30 metres on a good day. The site reliably attracts grey nurse sharks, which tend to congregate along the wall, alongside wobbegong and Port Jackson sharks resting on the reef structure. Pelagics including kingfish, trevally, and yellowtail work the water column, while rock lobsters and black cod hold the crevices lower down. Mild current keeps conditions manageable, but the depth demands solid buoyancy control and a sharp eye on your bottom time given the real nitrogen narcosis risk at these depths.
-31.72555, 152.86500
This is a boat-access site, so confirm charter availability and check local operators for current conditions before committing, as visibility and shark activity can vary considerably by season. September through May covers the most productive window, with the warmer months often delivering the clearest water.
Access is by boat from North Haven or nearby towns like Laurieton or Port Macquarie.
The maximum depth of 42m requires appropriate certification and management of bottom time to avoid nitrogen narcosis and decompression sickness.
Depth
30-42m
Visibility
10-30m
Skill Level
Advanced
Entry
Boat
Boat required
Water Temp
28-30°C
Current
Mild
Best Time
Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
Leah Lumps in New South Wales requires both Advanced Open Water and Deep Diver certifications due to depths ranging from 30 to 42 metres. The site is located off North Haven and is classified as an advanced-level dive requiring boat access. These certifications ensure divers have the necessary training to safely navigate the depth and manage nitrogen loading at this offshore pinnacle system.
Leah Lumps is renowned for Grey Nurse Shark encounters, along with regular sightings of Wobbegong sharks and Port Jackson sharks. The site's rocky structure and depth between 30 and 42 metres provides ideal habitat for these species. Divers also encounter large pelagics including kingfish and trevally, as well as resident black cod and rock lobsters amongst the lumps.
Leah Lumps reaches depths between 30 and 42 metres, making it a deep dive site requiring advanced certification. The underwater topography consists of rocky lumps rising from the seafloor off North Haven, New South Wales. At these depths, divers must carefully manage bottom times and be aware of nitrogen narcosis risk.
The optimal diving season at Leah Lumps runs from September through April, covering the Australian spring, summer and early autumn months. During this eight-month window, conditions are most favourable with visibility ranging from 10 to 30 metres and mild currents. This extended season provides excellent opportunities for Grey Nurse Shark encounters at the North Haven site.
Leah Lumps is strictly an advanced dive site and is not suitable for beginners. The 30 to 42 metre depth range requires Deep Diver certification, and the site presents risks including nitrogen narcosis and significant depth exposure. Only divers with Advanced Open Water certification and deep diving experience should attempt this offshore North Haven location.
The primary hazards at Leah Lumps are the extreme depth of 30 to 42 metres and associated nitrogen narcosis risk. Divers must carefully monitor their bottom time, air consumption and decompression limits at these depths. The site requires boat access and advanced certification due to these inherent deep diving risks, though currents are generally mild.
Leah Lumps is accessible only by boat from North Haven on the New South Wales coast. The site is an offshore pinnacle system with no shore access, requiring chartered dive boat services to reach the location. There are no facilities at the site itself, so all equipment and support must come from the boat.
A rashguard or 2mm shorty is recommended for diving at Leah Lumps in North Haven. Water temperatures range from 28°C to 30°C.
Leah Lumps in North Haven has depths ranging from 30 metres to 42 metres.