Rabbit Island is the small granite island off Five Mile Beach on the Prom's north-eastern coast, the first landmark for boats leaving Corner Inlet's eastern entrance, and Scuba Doctor lists two sites on it. The northern face is a 2–10 m reef dive for adventurous divers: a primarily sandy bottom with fringing near-shore reef and seagrass beds, offering good habitat variety and rich schooling fish populations, with sweep and zebrafish schools singled out and diverse species for photography. The island sits where Corner Inlet's tidal exchange meets Bass Strait, and the strong currents that result are both the site's defining hazard and the reason its shallow reef is lively – the granite fringe carries sponges and ascidians on its shaded faces and kelp on top, the seagrass between reef patches holds pipefish, cuttlefish, whiting and juvenile fish, and the schools of sweep and zebrafish that hang over the reef are joined by wrasse, leatherjackets, dusky morwong and old wives.

Rays lie on the sand. It is a shallow, easy dive in itself, made Advanced by the current and the exposure of the boat trip, and Scuba Doctor warns that Bass Strait's seas here are often wild and that experienced divers and favourable conditions are required. In practice it is a slack-water site done from Port Welshpool on a calm day, often as a first stop before continuing down the eastern Prom coast to Sealers Cove, or as a short day's diving in its own right when the outer coast is unworkable but the inlet entrance is calm.

The southern face, 700 m away, is the alternative in northerly winds. Within the Wilsons Promontory Marine Park (the older multiple-use park around the Prom's north-east); check current zoning for take restrictions.

Launch at Port Welshpool (sealed all-tide ramp on Corner Inlet, 2.5 hours from Melbourne) and run south-west out of the inlet's eastern entrance past Snake Island – about 15 km and 30–40 minutes – to Rabbit Island, the first island off the Prom's eastern coast. Anchor in sand off the northern face in 6–10 m at slack water; the channels around the island run hard.

Best dived with calm seas, no swell and no wind; light offshore south-west to south-east winds may be acceptable on the northern face. Strong currents run around the island where Corner Inlet's tides meet Bass Strait, so dive at slack water (Rabbit Island tide predictions), and the seas outside the inlet are often wild. Visibility is affected by inlet outflow and is best on the flood.

Summer and autumn.

Anchor off the northern face at slack, descend to the fringing reef at 4–8 m and follow it around the island's northern shore with the rock on one shoulder, crossing the sand and seagrass patches between reef sections. Turn at half gas or as soon as current builds and return to the anchor; carry an SMB in case of drift.

No dive charter operates at Wilsons Promontory. Sites are dived from club and private trailer boats – Dive La Trobe, VSAG, Melbourne University Underwater Club and Dive Victoria Group run occasional camping-and-diving trips – launching at Tidal River (beach launch, permit/key from Parks Victoria), Port Welshpool or Sandy Point. Wilsons Promontory Cruises (Port Welshpool) runs sightseeing cruises to Skull Rock and the islands but no diving.