Meet the site
Inner Corsair Wall is the section of the Nepean-side cliff that lies between Nepean Wall and Corsair Rock, the notorious pinnacle at the entrance. The Scuba Doctor listing describes it as 'a very spectacular wall dive with lots of ledges, caves and drop-offs', with the top of the wall at 10 m and the base at over 60 m. It is one of the best crayfish walls at the Heads – the guide notes good southern rock lobster taken at 38 m, though the site is now within the marine national park where all take is prohibited.
The shallow top is unusual for the Heads walls. At 10 m the reef is kelp-covered and broken, and it is here that the scattered wreckage of the P&O liner RMS Australia (wrecked on Corsair Rock in 1904) lies in 3–4 m of water on the rock nearby, according to the Corsair Rock listing. From the lip the wall falls away steeply, with the same stepped ledges and cut-back caves as Nepean Wall and the same heavy encrusting cover of soft corals and sponges. Blue devils, boarfish and old wives hold the caves, and seals from Point Nepean are regular visitors.
The site is right at the throat of The Rip and the listing is clear that it 'can only be dived on slack water as it is only just out of the Heads'. It also sits technically within the shipping channel even though ships do not normally pass over it, so the usual shipping check and live-boat protocol apply. The combination of a 10 m top and a 60 m base means a single dive can be pitched at any level, but the currents and position make it a site for experienced Heads divers and for the technical groups who use the base. It is dived less often than Nepean Wall and mostly by club and private boats.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Inner Corsair Wall is recorded as Wall in Port Phillip Heads. 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.
- Current and timing
- Ask how the operator assesses the current window for the actual route. Historical tide notes are not a departure instruction.
- 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 Inner Corsair Wall suitable for my certification?
The record lists Technical (decompression). 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 Inner Corsair Wall 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
Southern rock lobster, southern blue devil, soft corals, sponges, zoanthids, longsnout boarfish, old wife, kelp on the reef top, Australian fur seal, sevengill shark
Location
Wall on the Nepean side of the entrance, 177 m south of Nepean Wall and about 150 m north of Corsair Rock; the RMS Australia wreckage lies on the shallow reef nearby.
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.auscubadoctor.com.auRecord updated 27 Sept 2026. Source claims are being reviewed.
