Muirs Rock is a group of granite boulders about 200 m off the coast south of the Bicheno blowhole. The Marine Life Network guide rates it 8 out of 10 and calls it probably the best medium-depth dive at Bicheno, similar to The Ballroom at Bird Rock but larger. The boulders form a circle that creates small passages and an amphitheatre-like space in the middle, according to the Mudgee guide, and a large reef runs north-east from the rocks.

The rock walls are covered in life. Yellow zoanthids and jewel anemones fill the caverns and swim-throughs, sponges and ascidians cover the vertical faces and kelp grows on the tops. Butterfly perch swarm around the boulders, and banded morwong, wrasse, leatherjackets and bastard trumpeter are common. The caves are a good place to look for crayfish and bullseyes.

At 10-18 m, Muirs gives much of the colour of the deeper Governor Island sites with bottom times of 50 minutes or more, which makes it a popular second dive and a good choice for Open Water divers with some cold-water experience. The passages are short and open to the surface light, but the shallow depth means surge is felt quickly when swell is running.

Muirs Rock is not usually considered part of the Governor Island Marine Reserve, which is limited to a 400 m semicircle off the island's eastern shore, so check the rules if you are hoping to collect anything. Like most Bicheno boat sites it is currently dived mainly by visiting clubs and private boats rather than a resident dive shop.

Bicheno is on the Tasman Highway (A3), about 2 hr 15 min (180 km) from Hobart and 2 hr (160 km) from Launceston. Boats launch from the small ramp at The Gulch (Waubs Gulch), the narrow channel between Governor Island and the town foreshore off Esplanade; there is trailer parking beside the ramp and fishing co-op. The Governor Island sites are only 2-5 minutes' run out of the Gulch.

Tasmanian boat diving is almost always done as a live-boat drop and pick-up rather than at anchor. Muirs Rock is about 200 m off the coast just south of the blowhole on the southern side of town, around 5 minutes by boat from the Gulch.

The Governor Island sites face east into the Tasman Sea, so easterly and north-easterly swell over about 1.5 m, or a fresh easterly/north-easterly sea breeze, makes them rough and surgy and can close the Gulch entrance. Westerly and north-westerly winds blow offshore and give the flattest seas; southerly swell wraps in and stirs the bottom, and a big southerly can drop visibility under 2 m for days. Winter (June-September) usually brings the clearest water (20-30 m) and most settled westerly weather; summer afternoons are often spoiled by the NE sea breeze, so dive mornings.

Being close to shore and shallow, Muirs Rock is surgy in easterly swell over about 1 m.

Descend beside the boulders and circle the formation, entering the central amphitheatre and the small passages between the rocks. Then follow the reef north-east along its walls before returning. Keep depth at 10-16 m for a long dive and finish with a safety stop on the boulder tops.

No confirmed full-time commercial dive operator in Bicheno as of 2026: the long-running Bicheno Dive Centre was reported closed (Michael McFadyen) although some tourism pages still list it - verify before travelling. Sites are dived by club boats (Tas Uni Dive Club, Tasmanian Scuba Diving Club, Leven Scuba Club), the annual Combined Clubs Weekend each June, and occasional trips from Launceston (Tasmanian Divers) and Hobart (Go Dive Tasmania) shops.