Cape Connella is a headland on South Bruny's exposed east coast, south of Adventure Bay and Fluted Cape. The Marine Life Network guide describes shallow water of about 5 m near the cliffs, with a series of large rocks that shelter marine life, and a gradual slope to 18 m over a pebbly bottom where seaweed becomes luxuriant in deeper water. It notes that swell scours delicate growth from the shallows near shore, and that the run from Adventure Bay is long and difficult in bad weather.

The large rocks near the cliff provide the best habitat, with fish such as wrasse, leatherjackets, magpie and banded morwong and bastard trumpeter sheltering among them, and rock lobster in the cracks. Deeper down, the thick seaweed – crayweed, kelp and a variety of red algae – supports small invertebrates and weedy seadragons. Fur seals and dolphins travel along this coast, and humpback and southern right whales pass in winter and spring.

The site's exposure means it is only reached on calm days, and it is rarely dived, so fish may be less wary than in Adventure Bay's heavily fished shallows. It suits Open Water divers with cold-water experience. The coastline between Adventure Bay and Tasman Head is part of South Bruny National Park, with towering dolerite cliffs that are among Tasmania's most dramatic.

Combine it with Penguin Island or Adventure Bay's shore sites for an easier second dive on the way back to the ramp, and carry a VHF radio because mobile coverage along the cliffs is patchy. When the wind swings to the south-west the run home becomes rough, so plan to be back in the bay before any forecast change.

Bruny Island is reached by the vehicle ferry from Kettering (about 35 km, 40 minutes south of Hobart via the Southern Outlet and Channel Highway) to Roberts Point on North Bruny; the crossing takes about 20 minutes and runs frequently, but book or queue early in summer. From Roberts Point drive south across The Neck to Adventure Bay (about 35-40 minutes), where there are boat ramps and a jetty. There are no dive shops or air fills on Bruny – bring filled cylinders from Hobart or Kingston.

Cape Connella is a boat dive from the Adventure Bay ramps, about 15-20 minutes south past Fluted Cape; the Marine Life Network notes it is a long, difficult run in bad weather. Anchor off the cliffs on the pebbly bottom.

Adventure Bay faces east into the Tasman Sea and is sheltered from westerly and south-westerly winds, so it is often calm when the channel side is choppy. Easterly and north-easterly winds and swell make the bay and the outer sites rough; southerly groundswell wraps around Fluted Cape and Cape Connella. The Marine Life Network notes that swell reduces visibility and strips delicate growth from the shallow reefs.

Best after several days of westerlies; late summer and autumn are the most reliable. Heavy rain has little effect except near creek mouths.

Descend near the cliffs among the large rocks at about 5-8 m, then follow the gradual slope down to 15-18 m where seaweed is more luxuriant. Return up the slope.

No scheduled dive operator on Bruny; Underwater Adventures Tasmania runs South Bruny and Channel boat trips from Hobart; otherwise private boats from Adventure Bay. Pennicott Wilderness Journeys (Bruny Island Cruises) visits the coast by boat for sightseeing, not diving.