Meet the site
Tucked into a rocky cove on the northern side of Arthur Bay lie the remains of an old steam dredge. Local sources have long called it the Platypus, Townsville's first channel dredge, used to deepen the harbour approaches – that is the name the North Queensland Underwater Explorers Club uses. The Marine Life Network argues that it is more likely the iron bucket dredge Octopus, built in 1882 and scuttled in 1928; the club's own wreck index records the Octopus as scuttled six years after being beached in Nelly Bay and gives its location as off Desolation Point. Either way, the identity is not settled, and divers should treat the name as provisional. What survives is the machinery: the hull has largely broken up, but the huge square steam boilers and runs of steam plumbing remain, encrusted with hard coral at 3–7 m, hard against the shoreline. Fish use the structure heavily – the Marine Life Network lists large schools of angelfish, sergeant majors, parrotfish, batfish and trevally – and the surrounding granite boulders and coral add interest. Finding it is part of the dive. By boat, locals use the low point of a small hill above the cove and a large flat rock as marks. From shore, divers swim from Arthur Bay beach along the left-hand shoreline towards the point. The road to Arthur Bay is unsealed and often in poor repair, so many divers go by boat. It is a shallow, easy dive for Open Water divers, rarely visited and with a pleasing sense of discovery. Visibility and sargassum are the usual Magnetic Island caveats, and the site is best on a calm, clear morning in the cooler months.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Platypus Dredge Wreck (Arthur Bay) is recorded as Wreck in Townsville & Magnetic Island. The listed access is shore or 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.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- 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 Platypus Dredge Wreck (Arthur Bay) 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 Platypus Dredge Wreck (Arthur Bay) 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
Angelfish schools, sergeant majors, parrotfish, batfish, trevally, hard corals, small reef fish
Location
Boilers and plumbing of an old Townsville harbour dredge in a rocky cove on the northern side of Arthur Bay, hard against the shoreline.
Facilities nearby
Arthur Bay car park (unsealed road); no toilets at the bay; facilities at Horseshoe Bay.
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
nquec.org.aunquec.org.aumarinelife.org.auRecord updated 26 Sept 2026. Source claims are being reviewed.
