Pebbly Beach is rated 7 out of 10 by the Marine Life Network guide as an attractive shore dive by day or night. The rocky bottom reaches 10 m near shore in thick brown algae, extends to 15 m about 20 m out, and green algae become common deeper. Spires rising to 6-7 m are covered in marine life, with deeper spires in 15 m. Numerous species of nudibranch, cup sponges, zoanthids and basket stars live here, with butterfly perch, large long-snouted boarfish, luderick and the usual Bass Strait reef fish. The Leven Scuba Club includes Pebbly Beach in its Rocky Cape sites. Local divers typically combine two or three Rocky Cape and Sisters Island sites in a day, choosing the side of the cape that suits the wind and the state of the tide.

The Rocky Cape and Sisters Island area is, in the Leven Scuba Club's words, the best collection of dive sites on the north-west coast. The quartzite of Rocky Cape - some of the oldest rock in Tasmania - forms gutters, ledges, caves and bommies, and the tidal flow along Bass Strait keeps sponges, gorgonians, sea pens and bryozoans well fed. Michael McFadyen, diving here in February 2008, recorded 18-19 °C water and 20-25 m visibility, figures that surprise divers used to the east coast.

Rocky Cape National Park also protects Aboriginal cave sites and coastal heath above the water, and a Parks Pass is required for vehicles. The nearest hyperbaric chamber is the Royal Hobart Hospital, about four hours' drive away, so conservative profiles and oxygen on the boat are essential.

Rocky Cape National Park is off the Bass Highway between Wynyard and Stanley, about 30 minutes west of Wynyard and 1 hr 15 min west of Devonport (Spirit of Tasmania terminal). A Parks Pass is required. Boats launch at the Rocky Cape boat ramps (the western ramp at Mary Ann Bay suits boats up to about 5 m), Sisters Beach or Boat Harbour; ramps are shallow and weedy at low tide, so a 4WD tow vehicle helps.

Follow the rough road to the western boat ramp, then walk to the northern base of the point and enter from the rocks.

The north-west coast faces Bass Strait: north-westerly to north-easterly winds and westerly swell make it rough, while southerly winds blow offshore and give flat seas - light airs and sunny days are relatively common from January to April. Easterly gales are common in the warmer months and close the eastern faces of Rocky Cape and Sisters Island. Tidal streams run along the coast (eastward on the flood), and several boat sites are only comfortable around slack water.

Subject to a manageable current; calmest about 1.5 hours after the tide turns.

Enter at the point, drop to 10 m in the brown algae and head out to the 6-7 m spires and the deeper spires in 15 m, then return along the reef. Turn at a third of gas to allow for the swim back and a possibly harder exit, finish with a 3-minute safety stop at about 5 m if the depth allows, and exit where you entered unless an alternative exit has been checked beforehand.

No confirmed commercial dive operator on the north-west coast as of 2026 (older guides mention dive services in Wynyard and Devonport - verify). Sites are dived mainly by the Leven Scuba Club (Ulverstone), other north-west club members and visiting divers with their own boats; Tasmanian Divers (Launceston) runs occasional northern trips.