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SS Macedon Wreck: Rottnest Dive Guide
Rottnest Island's most accessible historic wreck: an 1883 iron steamer broken up across a 5-12m limestone reef, beginner-friendly wreck dive.
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Stay informed with diving tips, safety guides, and destination reviews
Nitrogen Narcosis: What It Is and How to Recognise It
By ScubaDownUnder Team
Nitrogen narcosis, sometimes called "the rapture of the deep" or just "narc," is the diving-specific impairment that happens when divers descend below approximately 30 metres on compressed air. The...
Bateman Bay: Ningaloo Manta Cleaning
By ScubaDownUnder Team
Ningaloo's most reliable reef manta cleaning station: year-round resident mantas on sheltered bommies in 10-15m, short charter from Exmouth.
SS Mauna Loa
By ScubaDownUnder Team
Five hundred metres west of the USAT Meigs, on the same sand floor in the outer reaches of Darwin Harbour, lies the SS Mauna Loa: a US merchant cargo ship sunk in the same morning attack that took...
Box Jellyfish: Australian Diver's ID Guide
By ScubaDownUnder Team
Australia's cubozoans up close: Chironex fleckeri, the Irukandji group, jimble, and the smaller species. Identification, biology, vision, seasonality, and what a stinger season actually means for divers.
USAT Meigs
By ScubaDownUnder Team
Two hundred metres east of Talc Head in Darwin Harbour, on a sand floor at twenty-eight metres, the largest casualty of the 19 February 1942 Japanese raid sits broadly upright in the dark green...
Diving Coral Bay: Ningaloo's Quieter Hub
By ScubaDownUnder Team
The southern hub of Ningaloo Reef. Year-round manta cleaning stations, seasonal whale sharks, and shore-accessible coral lagoon diving.
Diving with Manta Rays in Australia: Where, When, and How
By ScubaDownUnder Team
Manta rays are the largest of the rays, with wingspans reaching seven metres in the giant oceanic manta and four metres in the reef manta, and Australian waters host both species across an...
PADI Wreck Diver Course: Australia Guide
By ScubaDownUnder Team
How to qualify as a PADI Wreck Diver in Australia: prerequisites, course structure, where to train, kit needed, and what comes next.
Best Wreck Dives in Australia
By ScubaDownUnder Team
Australia's wreck diving runs from one-of-the-world's-best to historically distinctive, across every state and from accessible shallow shore dives to technical deep-water sites. The country's wartime...
Whale Sharks in Australia: Where, When, and How to Swim with Them
By ScubaDownUnder Team
The whale shark (*Rhincodon typus*) is the largest fish in the ocean, with documented individuals reaching 18 metres in length, and Australia is one of the three most reliable destinations on the...
British Motorist
By ScubaDownUnder Team
The British Motorist was a British Empire tanker, hit during the first wave of the Darwin raid and burning when she sank into the inner harbour. The fire and the subsequent decades of tidal action...
Best Time of Year to Dive in Australia: A Season-by-Season Guide
By ScubaDownUnder Team
Australia is the largest dive country in the world by coastline length, and the question of when to visit produces a different answer for every region. The tropical north peaks in the dry season; the...
Best Places to Dive in Western Australia
By ScubaDownUnder Team
Western Australia covers nearly a third of the country and produces the most varied diving conditions of any Australian state. The north end of the coast belongs to Ningaloo, where the southern...
Lighthouse Reef, South West Rocks
By ScubaDownUnder Team
Three kilometres off Smoky Cape on the South West Rocks coastline, in 15 to 22 metres of water below the white tower of one of NSW's oldest working lighthouses, a granite reef extends along the...
Decompression Sickness: Symptoms, Causes, and What to Do
By ScubaDownUnder Team
Decompression sickness, commonly called the bends, is the diving-specific medical condition every recreational diver should understand and very few experience. It happens when nitrogen absorbed into...
Waterfall Bay
By ScubaDownUnder Team
Below the tallest sea cliffs in Australia, where the dolerite columns of the Tasman Peninsula rise three hundred metres above the southern Tasman Sea, a series of sea caves cuts back into the rock at...
Best Places to Dive in Tasmania
By ScubaDownUnder Team
Tasmania produces the most distinctive temperate diving in the country and arguably some of the best cool-water diving in the southern hemisphere. The state's geology is dolerite, the same Jurassic...
North Solitary Island, Anemone Bay
By ScubaDownUnder Team
Sixteen kilometres off the Wooli coastline, on the northern face of a small island that breaks the open Pacific, a single sheltered bay holds what marine biologists have documented as the highest...
Fish Rock Cave
By ScubaDownUnder Team
Two kilometres off the South West Rocks coastline, a small rocky islet rises from the Tasman Sea. Beneath it, a tunnel runs clean through the rock for 125 metres, and inside that tunnel, almost...