Meet the site
Hugo's Trench takes its name from the pair of parallel fissures that run through the eastern flank of Julian Rocks, their sheer rock walls close enough together in places that divers pass through what feels like a canyon rather than open reef. Depths run from about 8 m at the top of the trenches to 18 m where they open out, and because the walls provide some shelter from swell and current this is often the site of choice when the fully exposed Cod Hole is too rough to dive safely, making it one of the more consistently runnable Julian Rocks sites through the cooler, swellier months. The trench walls themselves are a highlight for photographers: narrow gaps and undercuts are stacked with nudibranchs, painted crayfish, mantis shrimp, moray eels and small reef fish, and Byron Bay Dive Centre markets this specifically as a macro site for exactly that reason. At a larger scale, wobbegong sharks lie along the trench floor and under the overhangs, sea turtles pass through routinely, and leopard sharks are seen resting in the sandier sections during summer. In winter grey nurse sharks occasionally use the trench as well, sheltering from current the same way they do at the Cod Hole a little further along the same side of the island. Divers need reasonable buoyancy control to work through the narrower sections without brushing the walls, and surge can funnel unpleasantly through the trench in a decent swell, which is the main reason operators will skip the site on genuinely rough days rather than the more exposed Cod Hole logic of simply being too dangerous. On a good day, though, Hugo's Trench offers the best combination at Julian Rocks of dramatic swim-through-style topography, rich macro life and a moderate, Open Water-friendly depth range, and it is often run as the second dive of a Julian Rocks double after the Nursery or Needles.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Julian Rocks – Hugo's Trench is recorded as Reef in Tweed & Byron Bay. The listed access is boat. 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.
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 Julian Rocks – Hugo's Trench suitable for my certification?
The record lists 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 Julian Rocks – Hugo's Trench 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
Wobbegongs, turtles, nudibranchs, painted crayfish, mantis shrimp, moray eels, leopard sharks (summer), grey nurse sharks (occasional, winter), small reef fish
Location
A pair of parallel trenches with sheer walls cutting through the rock on the eastern side of Julian Rocks, sheltered enough inside the trench walls to dive on days too rough for the fully exposed sites.
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
sundive.com.audiveplanit.comabyss.com.ausundive.com.aubyronbaydivecentre.com.auadreno.com.auRecord updated 26 Sept 2026. Source claims are being reviewed.