Cathedral earns its name from the dramatic rock formations that create a natural overhead environment, drawing advanced divers to explore its cavern-like passages. The site sits in deeper waters between 18 and 22 metres, where visibility ranges from 9 to 30 metres depending on conditions. Variable currents demand solid buoyancy control and navigation skills as you thread through the swim-throughs. The cold Tasmanian waters host an impressive cast of marine life. Weedy seadragons drift among the kelp forests, their elaborate appendages providing perfect camouflage. Fur seals occasionally investigate divers with their characteristic curiosity, while draughtboard sharks rest in the shadows. The rocky substrate supports healthy populations of crayfish and abalone, with schools of bullseyes adding movement to the scene. The overhead environment presents genuine hazards that require proper training and planning. Entanglement risks exist in the kelp and within the structure itself, making redundant lighting and appropriate line-handling skills essential. The cold water demands adequate thermal protection. Access is by boat only, with several operators offering guided dives and equipment rental. Summer months (December through February) and winter (June through September) provide the most reliable conditions, though water temperature varies significantly between these periods.
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Summer months bring the best visibility, often pushing toward that 30-metre upper range, but winter diving from June through September can deliver exceptional encounters with fur seals when boat traffic is minimal. Go with a guided charter on your first visit to understand the current patterns before diving it independently.
The site is accessible via a short boat ride from Eaglehawk Neck. Dives are operated by local dive centres such as Eaglehawk Dive Centre. The boat moors to the walls of the inlet above the cave system.
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The dive is within a cave system, which is an overhead environment requiring excellent buoyancy control. Some tunnels are narrow. Diving is only possible in suitable sea conditions.
Depth
7-40m
Visibility
9-40m
Skill Level
Advanced
Entry
Boat
Boat required
Water Temp
21-24°C
Current
Mild
Typical Dive
45 min
Best Time
Year-round
Cathedral near Eaglehawk Neck is renowned for weedy seadragons, which are often spotted amongst the kelp-covered walls. Divers also encounter Australian fur seals, draughtboard sharks, crayfish, abalone, and colourful invertebrates throughout the cavern system. The site's bullseyes and abundant marine life make it one of Tasmania's premier underwater photography locations.
Cathedral requires a minimum of Advanced Open Water certification due to its overhead environment and depths of 18 to 22 metres. The site presents significant hazards including entanglement risks, cold water temperatures, and potential low visibility conditions. Divers should have experience with cavern environments and be comfortable diving in water temperatures ranging from 10 to 18 degrees Celsius.
Cathedral is accessible only by boat from Eaglehawk Neck, with boat charters, guided tours, and equipment rental available through local dive shops. The site cannot be reached from shore, so all dives must be conducted via organised boat trips. No entry fee is charged to dive the site.
Cathedral is best dived during summer months (December to February) and winter months (June to September) when conditions are most favourable. Water visibility ranges from 9 to 30 metres depending on seasonal conditions, with summer offering warmer water temperatures up to 18 degrees Celsius. Winter diving provides excellent clarity but requires exposure protection for water temperatures as low as 10 degrees Celsius.
Cathedral receives a 5 out of 5 snorkel rating, making it an exceptional snorkelling location despite the site's advanced diving requirements. Snorkellers can observe the cavern entrance and surrounding kelp forests from the surface near Eaglehawk Neck. The site's diverse marine life including seadragons and fur seals can be spotted in shallower areas accessible to snorkellers.
Cathedral presents several significant hazards including overhead environments within the cavern system, entanglement risks from kelp and marine growth, and cold water requiring appropriate thermal protection. Visibility can drop to as low as 9 metres in poor conditions, making navigation challenging inside the cavern. Divers should carry proper lighting equipment and maintain awareness of their proximity to the ceiling and walls.
Cathedral dive site sits at depths between 18 and 22 metres, placing it within the advanced recreational diving range. The cavern system features a relatively flat bottom depth with the overhead environment creating the main complexity. These depths allow for reasonable bottom times while requiring proper buoyancy control to avoid contact with the cave ceiling and colourful invertebrate life.
Cathedral in Eaglehawk Neck requires advanced diving skills. Expect deeper depths, currents, or challenging conditions that are not suitable for newly certified divers.
Yes, equipment rental is available at or near Cathedral in Eaglehawk Neck. Contact local dive operators for specific gear availability and prices.
A 5mm wetsuit is recommended for diving at Cathedral in Eaglehawk Neck. Water temperatures range from 21°C to 24°C.
