Fraggle Rock is another of the Muirons' five most popular moored sites. Travel accounts from Exmouth Diving Centre trips record trumpetfish, glassfish, pennantfish (bannerfish) and giant groupers on the dive, and the Aussie Marine Adventures series groups it with sites that have networks of tunnels and swim-throughs filled with swarms of glassfish and large cod.

The reef is rocky limestone outcrops with holes, overhangs and gaps at 8–20 m, covered in hard and soft corals and sponges. Large groupers and cod shelter in the holes, schools of glassfish fill the shade, and reef sharks, turtles and nudibranchs are regular sightings. It is usually the second dive of a Muiron day after Cod Spot, when the skipper wants a more sheltered mooring.

Visibility can drop markedly around the full moon spawning period in autumn, when accounts describe cloudy water, but the fish life remains. Suitable for Open Water divers.

Muiron trips have been affected by the 2025 bleaching event and Dive Ningaloo's pause; check with other operators for current trips.

About the Muirons: North and South Muiron are two low, uninhabited limestone islands about 15 km north-east of the tip of North West Cape, protected within the World Heritage-listed Muiron Islands Marine Management Area. They are reached only by boat, which has kept the surrounding reefs relatively untouched. The waters are visited by dolphins, dugong, pilot whales and, from July to October, migrating humpback whales, and turtles nest on the island beaches in summer. The islands are well known for strong currents and changeable conditions, so dives are always chosen on the day by the skipper according to wind, swell and tide, and a day on the Muirons usually combines two sites with lunch on the boat in the lee of the islands.

Muiron trips leave Exmouth early (around 8:00–8:30 am). Operators collect divers or meet at their shop, then launch from Exmouth Marina (2 km south of town) or Bundegi boat ramp (14 km north). The islands lie about 15 km (9.8 nautical miles) north-east of the tip of North West Cape; the run takes roughly 1 hour from the marina and less from Bundegi, and it can be bumpy in a south-westerly.

Sites have public moorings; the boat ties off and divers giant-stride from the stern. Full-day double-dive trips with lunch on board.

The Muirons are exposed: the crossing and the western sides take the brunt of south to south-westerly winds and swell, and the afternoon sea breeze (often 15–25 knots, especially October–March) makes the return trip rough, so trips run early and are frequently cancelled for wind. Strong tidal currents run between and around the islands; drift sites such as The Gap are timed with the tide, and building swell often limits which side of South Muiron is diveable. Visibility 5–20 m, lower during plankton blooms and after the March–April coral spawn.

Cyclone season November–April. DBCA advises carrying a PLB because conditions can change quickly.

Descend the mooring to the reef base, work through the rocky outcrops and holes at 12–16 m looking for groupers, pennantfish and trumpetfish, then circle back up the reef to the mooring for a safety stop.

Dive Ningaloo paused all Muiron Islands diving from 21 August 2025 after the coral bleaching event (replaced with Westside trips); Exmouth Dive & Whalesharks Ningaloo (Exmouth Diving Centre) runs Muiron dive and snorkel day trips when weather allows; Ningaloo Whaleshark Swim and Ningaloo Whaleshark-N-Dive offer Muiron dives on request. Check current status before booking.