Wrack Bay, also known as Garretts Bight, lies in the Port Esperance area near Dover. The Marine Life Network guide describes it as a very attractive and easy dive with fair to good visibility, in 5-15 m, where large reefs and rocks form shelter and sand-filled gutters cut between them. It lists sand-dwelling fish, nudibranchs and various reef species, and notes the bay is exposed to southerly swell and requires good weather.

The alternation of reef and sand gives the dive variety: kelp and brown algae on the reefs, fish sheltering under ledges, and flathead, stingarees and gobies on the sand. Nudibranchs are a highlight for macro enthusiasts, crawling over sponges and bryozoans on the rock. Wrasse, leatherjackets, magpie morwong and bastard trumpeter are common, and rock lobster may be found in deeper cracks.

It is an easy, relaxed boat dive suitable for Open Water divers, and a pleasant option on a calm day in the far south. The name 'wrack' refers to seaweed cast up on the shore, a hint of the rich algal growth in the bay. Documentation is limited to an older guide, so treat details as indicative.

Because the gutters make natural navigation lines, the site is easy to find your way around even with modest visibility, and it suits photographers who want both macro subjects and reef scenery on a single dive. The far south has no dive shop, so bring filled cylinders from Hobart or Kingston, and allow for patchy mobile coverage by carrying a VHF radio and leaving a trip plan.

Dover is on the Huon Highway about 85 km (1 hour 20 minutes) south of Hobart via Huonville and Geeveston. There are boat ramps and jetties at Dover and around Port Esperance. Wrack Bay (Garretts Bight) is reached by boat from the Port Esperance ramps; the Marine Life Network notes it is exposed to southerly swell and needs good weather.

Anchor in a sand gutter.

The far south – Port Esperance, Southport and Recherche Bay – opens southward to the Southern Ocean. Southerly and south-westerly swell and strong southerly winds make the exposed sites unworkable and quickly reduce visibility, while northerly and light westerly winds give calm water. Sheltered bays such as Port Esperance and inner Recherche Bay remain diveable in moderate conditions.

Weather changes rapidly and fronts arrive every few days; plan around high-pressure systems in late summer and autumn and watch for south-westerly changes. Wrack Bay is exposed to southerly swell.

Anchor in a sand gutter, explore the adjacent reefs and rocks, following gutters out to 15 m and back, watching for sand-dwelling fish and nudibranchs.

No regular operator; private boats and club expeditions. Underwater Adventures Tasmania runs occasional far-south trips (the Acteons are mentioned by Go Dive Tasmania as a kelp-diving area).