Meet the site
Rotomahana was a landmark ship. Built by William Denny and Brothers at Dumbarton in 1879 for the Union Steam Ship Company of New Zealand, she was the first ocean-going vessel built of mild steel and one of the first with bilge keels; 90.9 m long, 1,777 tons and fast enough to be called the 'Greyhound of the Pacific'. She ran the trans-Tasman route and later the Melbourne–Launceston Bass Strait service until the 1920s. Sold for scrap, she was stripped and scuttled with a gelignite charge in the engine room on 29 May 1928. The wreck lies in 35–39 m with the bow roughly to the east and is badly broken: the scuttling charge and 90 years of Bass Strait swell have reduced most of the hull to plates, girders and debris spread across the sand. What remains is nonetheless impressive in scale. Amidships stand four large condensers and the boilers, rising several metres and forming the core of the dive, with some pass-through possible between and beneath them for wreck-trained divers. The clipper bow has separated from the rest of the hull and lies apart with anchors, winches and the bowsprit still in place – the most photogenic corner of the site. A deckhouse that was once penetrable has collapsed. Large schools of butterfly perch, bullseyes and sweep patrol the boilers, with ling and crayfish in the debris and sponges and zoanthids on every upright surface. Visibility here is often better than on the inshore subs because the site is further from the Barwon River plume. Because most of the interesting structure sits at 36–39 m, bottom time is short and every Rotomahana dive carries some decompression. It suits experienced deep divers who value history as much as intact structure, and it is a popular first 'proper' technical wreck for Melbourne divers moving on to trimix.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
SS Rotomahana is recorded as Wreck in Port Phillip Heads. 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.
- Lines and obstructions
- Discuss any known entanglement concerns and the suitability of the planned area.
- 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 SS Rotomahana 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 SS Rotomahana 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
Butterfly perch, bullseyes, sweep, ling, southern rock lobster, sponges, yellow zoanthids, boarfish, occasional seal
Location
Eastern Ships' Graveyard about 6 km south-west of Point Lonsdale, on the sand west of J1.
Facilities nearby
Departure from Queenscliff Harbour (parking, toilets, cafes, fills at Dive Victoria/Queenscliff Dive Centre) or Portsea Pier (parking on Point Nepean Road, toilets, cafes).
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
scubadoctor.com.auscubadoctor.com.audivernet.comRecord updated 26 Sept 2026. Source claims are being reviewed.
