Meet the site
Cathedral Cave is the signature dive of the Tasman Peninsula and is regularly described as the largest sea-cave system in Australia. The entrance is a soaring arch in the cliff at the back of Waterfall Bay, broad and high enough that daylight floods the first chamber and divers can hover in open water while looking up into a dome of rock. From there the system tunnels back into smaller caverns, narrow passages and cross-connections. The names given by the Eaglehawk Dive Centre crew are part of the experience: the Catacombs, tunnels wide enough for one diver at a time that lead to an inner chamber; the Back Door exit; Revelation Bend, where sunlight slants into the passage; Skull Cave, a dark gravel-floored passage with two eye-hole openings; and the Devil's Tonsils, a tight passage that curves upward and needs careful buoyancy. Maximum depth at the entrance is about 21 m and most of the dive is between 10 and 18 m. What makes the cave remarkable is the life on its walls. Because the rock is shaded and swept by clean oceanic water, invertebrates that normally live in deep water grow here in the shallows: jewel anemones in pink, orange and yellow, golden zoanthids, sponges (including species endemic to the area), ascidians, bryozoans and hydroids. Marine biologist Karen Gowlett-Holmes, co-owner of the dive centre, has recorded species new to science on these walls. Clouds of bullseyes hang in the darker sections, draughtboard sharks rest on ledges and rock lobsters peer from cracks. The cave is dived as a guided tour. Open Water divers can do the main route with a guide, but good buoyancy control and comfort with an overhead environment are essential, and the deeper or tighter passages are reserved for experienced divers. It is an outstanding photographic site, with the light shafts at the entrance and Revelation Bend the classic wide-angle images, and the wall invertebrates rewarding macro shooters. The site has been featured in international magazines and is the reason many divers travel to Eaglehawk Neck. Pair it with a second dive in the canyons or on the Waterfall Bay walls, which share the same colourful invertebrate cover without the ceiling.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Cathedral Cave is recorded as Cave/Cavern in Tasman Peninsula. The listed access is boat (day trip). Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Topics flagged by the stored research
These are questions prompted by the existing notes, not a verified or complete hazard assessment.
- Water movement
- Ask how swell and local exposure affect the proposed entry, exit and route.
- Overhead environments
- Ask whether the plan stays entirely in open water. A wreck or cave listing is not permission or training to enter.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Cathedral Cave suitable for my certification?
The record lists Advanced Open Water. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Cathedral Cave through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Jewel anemones, golden zoanthids, endemic sponges, ascidians, bryozoans, hydroids, schools of bullseyes, draughtboard sharks, southern rock lobster, butterfly perch, weedy seadragons at the entrance, occasional fur seals
Location
Large sea-cave system cut into the dolerite cliffs of Waterfall Bay on the east coast of the Tasman Peninsula, about 8 minutes by boat south of the Pirates Bay jetty at Eaglehawk Neck.
Facilities nearby
Eaglehawk Dive Centre has air fills, hire gear, a training pool and accommodation; toilets and a small store at Eaglehawk Neck.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
xray-mag.comeaglehawkdive.com.auindopacificimages.comdivernet.comtsdc.org.aumarinelife.org.aublog.padi.comRecord updated 27 Sept 2026. Source claims are being reviewed.
