The Toba is a small wreck with a surprising history. Divingwawrecks describes her as a wooden fishing vessel, less than 20 m long, originally a pearling lugger from the Torres Strait and later Broome. Marinelife.org.au adds that she was a small wooden ketch built in the Aru Islands, Indonesia, in 1907, owned by Clark & Co. - a company with more than 200 schooners and luggers based at Thursday Island and Broome for pearling and fishing - and that she ran ashore in 1933.

The remains cover about 10 by 5 m against the sloping reef shelf on the south side of Peak Island, in about 7.6 m. Timber frames, ballast stones and a windlass are visible. The wreck itself is modest, but divingwawrecks notes that the surrounding overhangs and hard corals around Peak Island make it a nice, easy dive, and marinelife.org.au describes the island's weedy limestone reef in 7-15 m with lots of fish life.

The combination of a small heritage wreck and sheltered reef, less than a kilometre from the ramp, makes this a good second dive after the wrecks along the beach, or a first boat dive for newer divers. Mushroom Rock and Mushroom Reef, immediately nearby, extend the options.

Hamelin Bay was a timber port from the 1880s, when a jetty built in 1882 and extended in 1898 served M. C. Davies' milling operations. It was notorious for wrecks in bad weather because it is exposed to the north-west gales of winter storms; the 22 July 1900 storm alone wrecked several ships, and only the old jetty piles remain today. The bay is now a recreation zone in the Ngari Capes Marine Park, and every wreck in it older than 75 years is protected.

Hamelin Bay is on the coast west of Karridale, about 35 km south of Margaret River and 30 km north of Augusta, reached via Caves Road and Hamelin Bay Road. Park at the boat ramp/jetty area beside the Hamelin Bay Holiday Park. Launch at the Hamelin Bay boat ramp - marinelife.org.au warns it is narrow, slippery and swell-exposed, and a 4WD may be needed.

Peak Island is to the left of Mushroom Rock when viewed from the ramp, less than 1 km away. Anchor on sand in the lee of the island and swim to the wreck on the south side against the reef shelf.

Divingwawrecks describes the surrounding reef as an easy, sheltered option and gives a limit of under 1.5 m swell. Best on calm summer days; swell stirs the sand and reduces visibility. General pattern on the Capes and Leeuwin coast: summer mornings often have light easterly (offshore) winds before a south-westerly sea breeze, and long-period south-westerly groundswell can arrive on otherwise calm days; winter fronts bring big swell and north-westerly winds.

Check the Bureau of Meteorology swell forecast, not just the wind.

Descend at the wreck on the south side of the island (7-8 m), examine the frames, ballast stones and windlass, then explore the overhangs, hard corals and weedy limestone reef around the island to 15 m. Agree a turn pressure before descending (half gas, or a third where current is likely), carry a DSMB, and make a 3-minute safety stop at 5 m.

No operator; private boats from Hamelin Bay. Nearest dive services: Swan Dive (Busselton/Port Geographe) for fills, hire, nitrox and charters; no dive shop in Margaret River or Augusta.