Seal Cove is one of the less publicised King George Sound sites, and one of the most attractive when conditions allow. Marine Life Network's Albany list describes a reef in 18-30 m with large gorgonian fans, black coral and a coral garden, supporting a wide range of reef species, and notes that visibility here is rarely below 20 m – considerably clearer than on the HMAS Perth and the inner sound.

The depth and clarity give the site a distinctly different feel from the shallow granite reefs around the islands. The fans are big and intact, the black coral forms bushes on the deeper ledges, and the plate and encrusting corals that turn up in patches across the sound form a more continuous garden here. Expect blue groper, queen snapper, harlequin fish, boarfish, western blue devils and schools of bullseyes, with kingfish and samson fish passing overhead.

Because the site starts at 18 m and runs to 30 m, it suits Advanced Open Water divers who are comfortable managing depth and no-decompression limits in cold water. Nitrox is useful. It is sheltered from ocean swell and most winds, but exposed to the north-easterly that blows into the sound on many summer afternoons.

Little has been published about Seal Cove beyond Marine Life Network's summary, and the exact location is not given in public sources. Divers should book through the local dive shop, which will select it when the weather suits. It is a good choice for experienced divers wanting deeper reef scenery on a day when the Breaksea walls are out.

Albany is 418 km (about 4.5 hours) south-east of Perth via Albany Highway. Charter boats and private boats launch either from the Emu Point boat ramp (Emu Point Drive, 7 km north-east of the CBD, with a large trailer car park, toilets and a fish-cleaning station) or from the town ramp beside the Albany Waterfront marina in Princess Royal Harbour, which exits into King George Sound through the harbour entrance past Possession Point. Seal Cove is a boat dive in King George Sound; the exact mark is held by local operators and is not published.

It is usually visited on a South Coast Diving Supplies charter from Albany. Allow 15-25 minutes from either ramp depending on conditions.

King George Sound is sheltered from the Southern Ocean by Flinders Peninsula, Bald Head and Breaksea and Michaelmas Islands, which is why Albany can offer diving on days when the open coast is wild. Marine Life Network notes that Seal Cove is sheltered except in strong north-easterly winds and that visibility is rarely below 20 m, which is exceptional for the sound. Strong NE-E winds (common on summer afternoons) make it rough; mornings and westerly or southerly weather are best.

Descend to the reef at about 18-20 m, then work deeper along the reef toward 25-30 m to find the largest gorgonians and black coral, keeping an eye on no-decompression time. Return shallower across the coral garden and ascend with a safety stop on a DSMB or the anchor line.

South Coast Diving Supplies (Albany) – the town's dive shop; runs scheduled boat dives in King George Sound most weekends and on demand in summer/autumn, and issues HMAS Perth permits.