Meet the site
The Canyon is a sand-bottomed indent into the Governor Island reef that begins about 20 m wide at its seaward (eastern) mouth and runs west into the reef. Its northern side is a vertical wall more than 15 m high with overhangs, and on the southern side are large boulders split by cracks and swim-throughs. The sand is about 37 m at the mouth and 33-35 m at the inner end, while the reef top is at 18 m or less.
The Combined Clubs Weekend guide calls it a valley between submerged cliffs and describes enormous, colourful sponges interspersed with ascidians, hydroids, sea whips, sea fans and anemones. The wall face is also covered in yellow zoanthids, and McFadyen noted yellow sea spiders, some with black leg bands, on the kelp, as well as crayfish and abalone tucked into the overhangs. Long-snouted boarfish patrol the canyon, and the kelp on the reef top is large and thick, moving with any surge. A garden gnome wearing a dive mask and a garden frog have been placed in the canyon by local divers and have become part of the dive.
The shape of the site makes for an easy, satisfying dive plan: in along one wall, across the boulders, and up a crack to the top. The deepest part is at the start, so divers can work progressively shallower. The Canyon shares its boulder section with Castle Cave to the south, and the two sites are often combined on consecutive dives.
It is a site for experienced divers with deep training who want a structured dive with walls, sponge gardens and swim-throughs in a single plan. Photographers like the vertical wall and its overhangs, and naturalists spend whole dives on the sponges.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
The Canyon (Bicheno) is recorded as Wall in Tasmania East Coast. 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.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- Planned depth
- Confirm the intended route and training requirements; the recorded maximum is not a target.
- 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 The Canyon (Bicheno) suitable for my certification?
The record lists Deep/Advanced + experience. 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 The Canyon (Bicheno) 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
Sponges, sea whips, sea fans, ascidians, hydroids, yellow zoanthids, anemones, yellow sea spiders, long-snouted boarfish, butterfly perch, banded morwong, southern rock lobster, abalone, kelp
Location
A sand-floored gutter cutting east-west into the reef on the eastern side of the southern end of Governor Island, Governor Island Marine Reserve.
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
michaelmcfadyenscuba.infoccwtasmania.commarinelife.org.auparks.tas.gov.auRecord updated 26 Sept 2026. Source claims are being reviewed.