Deep Creek is listed on Wikivoyage among the Victor Harbor–southern Fleurieu dive areas, alongside the better-known Blowhole Beach, but there is no published dive guide for its specific beaches. Deep Creek Conservation Park protects a spectacular stretch of the southern Fleurieu coast, with steep valleys running down to rocky beaches on Backstairs Passage. Boat Harbor Beach, reachable by a steep gravel road (4WD recommended) or a shorter walk, and Deep Creek Cove, reached only by a 6.5 km return hike, are the two main access points to the water.

Visitors report dolphins at Boat Harbor Beach, and the coast is broadly similar to the Blowhole: rocky reef, boulders and kelp exposed to the clean, cold water of Backstairs Passage, which should support crayfish, blue groper, harlequin fish, wrasse, sweep, leatherjackets, abalone and possibly seadragons and seals. These are expectations based on the Blowhole and regional ecology rather than documented dive observations. The main constraints are access and exposure.

Carrying scuba gear down the steep tracks is hard, and the beaches face directly into the prevailing south-westerly swell, with strong tidal streams in the passage. Diving here is only realistic on rare calm days, and should be done with local knowledge. For most divers, Deep Creek is best treated as a snorkelling or freediving destination combined with camping in the park, or as an exploratory dive for experienced, self-sufficient groups.

Anyone who dives it is encouraged to report conditions and marine life to the Scuba Divers Federation of SA, as no recent account exists.

Deep Creek Conservation Park is about 1 hour 40 minutes south of Adelaide via Delamere; pay the park entry fee. Boat Harbor Beach is reached by a gravel road that becomes very steep near the end (4WD recommended), with a shorter walking route from a parking area. Deep Creek Cove is reached only on foot, a 6.5 km return hike from Trig Campground on an overgrown and steep path – impractical with scuba gear, but possible for snorkellers or freedivers.

Exposed south-facing coast on Backstairs Passage, open to south-westerly swell and strong tidal streams. Only diveable on rare calm days after northerly winds with small swell. Visitors describe Deep Creek Cove as super rough and windy.

Visibility is typically high in calm conditions due to oceanic water. Plan around slack tide, and allow for the long climb out afterwards.

Choose a sheltered corner of Boat Harbor Beach, snorkel first to check conditions, then dive close inshore along the rocks at 3-6 m, staying near the exit.

No operator; occasional private and club visits.