Sealers Cove is the big sweep of beach and swamp on the eastern Prom that George Bass named in 1798 for the sealers already working from it, and it is the first day's destination on the Prom's classic eastern circuit walk. Scuba Doctor lists it as a 2–15 m reef dive suitable for scuba from a boat and snorkelling from the shore, on the fringing reef along the southern bay: small boulders gently sloping down to a sandy bottom, bordered by forested headlands. It is an easy, pretty dive rather than a dramatic one.

The southern shore's granite boulders are modest in size and carpeted in kelp and mixed algae, with attractive marine invertebrate growths in the crevices – sponges, ascidians, feather stars, anemones and nudibranchs – and the site is known for large populations of boarfish and leatherjackets, with wrasse, old wives, morwong, sweep and zebrafish alongside, bullseyes in the shade and Port Jackson sharks and stingarees on the sand. Seagrass in the cove's shallows holds pipefish, cuttlefish and juvenile fish. The 2 km beach and the creek from Sealers Swamp mean the cove silts easily in bad weather and needs a few settled days to clear; on those days visibility is good and the southern corner, sheltered from the south-westerly, is calm.

Walkers snorkel it from the southern end of the beach; scuba divers come by boat from Port Welshpool, for whom it is the first site on the eastern run and a natural warm-up or last dive before heading home. It suits beginners and snorkellers and anyone wanting a gentle, fish-rich dive in a spectacular setting; within the marine national park, no take.

Boat only. Launch at Port Welshpool (sealed all-tide ramp, jetty and trailer parking on Corner Inlet, 2.5 hours from Melbourne) and run south through Corner Inlet's marked channels and out past Rabbit Island down the eastern Prom coast – about 30–40 km and 60–90 minutes to Sealers/Refuge Cove, longer to Waterloo Bay and South East Point. The coast is exposed to easterly and southerly swell and has no facilities; carry fuel, radio and all air, and plan around the weather window and Corner Inlet tides.

Sealers Cove is the first of the big eastern coves, about 30 km from Port Welshpool; anchor off the southern shore's fringing reef in 8–12 m. Walkers reach the cove from Telegraph Saddle car park (10 km, 3 hours) and can snorkel from the southern end of the beach – carrying scuba gear that far is not practical.

Best with calm seas, no swell and no wind; avoid strong onshore north-easterly to easterly winds, which put swell straight into the cove. Scuba Doctor warns the site can get silty and is easily stirred up by bad weather, so allow a few calm days after a blow. Summer and autumn; the cove's southern corner is sheltered from the south-westerly.

Anchor off the southern shore, descend onto the small boulders at 5–8 m and follow the fringing reef along the southern side of the bay towards the entrance point, to a maximum of 12–15 m. Look into the crevices for invertebrates and watch the boarfish and leatherjacket schools; turn at half gas and return along the reef at a shallower depth to the boat.

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.