Solitary Islands Marine Park (offshore dive sites)

High risk: Rapid ascent risk

Deeper mooring lines (21 m) combined with expanding air in buoyancy vests can cause uncontrolled ascents, increasing the risk of decompression sickness.

High risk: Depth and Decompression Risk

Many offshore moorings are in 15-21 m of water with gutters dropping to 30 m. Inexperienced snorkelers/divers risk exceeding limits or rapid ascent leading to decompression sickness.

Moderate risk: Strong ocean currents

The East Australian Current can create strong north-to-south flows around the islands, especially at Manta Arch and Cleaner Station, making it difficult to swim against or start/finish dives at mooring points.

Moderate risk: Depth hazards

Several dive sites have moorings in depths of 12–21 metres with gutters tailing to 30 metres. Inexperienced divers risk exceeding no-decompression limits or rapid ascent if they follow bottom contours back to moorings.

Moderate risk: Deep water snorkelling (5-20m)

Snorkel sites range from 5-20 metres depth with no shallow bottom to stand on. Strong swimming skills and previous snorkelling experience are mandatory.

Moderate risk: Ocean swells and surge

Exposed island sites can experience significant ocean swells and surge, particularly around North Solitary Island, making conditions challenging for less experienced swimmers.

Moderate risk: Strong currents

Tidal currents can be strong between the islands and around headlands, especially during tide changes.

Moderate risk: Ocean swell and wave action

Even in the shelter of the islands there is always some wave action; surface conditions can become too choppy for safe snorkelling.

Moderate risk: Strong currents (East Australian Current)

The convergence of tropical and temperate currents can create strong unpredictable flows around the island reefs.

Moderate risk: Deep water snorkelling (5–20 m)

Snorkel sites are in 5–20 m depth with no shallow areas to stand; snorkellers must be strong swimmers comfortable in deep water.

Moderate risk: Strong East Australian Current

The EAC can produce powerful north-to-south currents around the islands, making it difficult to start dives or swim back against the flow. Drift diving conditions require experience.

Moderate risk: Exposed Offshore Conditions

Sites are 8 km offshore (South Solitary Island) and fully exposed to ocean swells, wind, and changing weather. Choppy surface conditions can make entry/exit hazardous.

Moderate risk: Tidal currents

Powerful tidal streams run between the islands and headlands, especially during spring tides, requiring good fitness and awareness.

Low risk: Boat traffic

All offshore sites are accessed by boat from Coffs Harbour marina, with dive charter vessels and other watercraft operating in the area. Snorkelers must stay aware of boat traffic near mooring points.

Low risk: Variable surface conditions

Swell and wind can create choppy surface conditions, requiring good swimming ability. Trips are often postponed or cancelled if conditions are unsuitable.

Low risk: Limited visibility

Visibility can fall below 15 metres minimum threshold needed for safe enjoyable snorkelling. Conditions vary day-to-day and seasonally.

Low risk: Open ocean swell exposure

The islands offer limited shelter from ocean swell; some wave action is always present even in lee of the islands.

Low risk: Marine stingers

Bluebottles (Portuguese man o' war) and other jellyfish can occur, more common in warmer months.

Low risk: Variable water visibility

Visibility must exceed 15 m for a trip to run; poor conditions often cause cancellations. Choppy seas reduce visibility rapidly.

Low risk: Limited shore access — boat only

There are no shore-entry snorkelling sites; access is only by boat. Snorkellers must be able to enter and exit the water from a vessel in open conditions.

Low risk: Swell and surge on exposed reefs

Sanctuary zones around outer islands catch open-ocean swell; surge can push snorkelers onto reef

Low risk: Ocean swell and surge

Moderate to strong swells from the east and south-east can create challenging surge conditions around exposed reef edges, particularly at South and North Solitary Islands.

Low risk: Sanctuary zone boundary awareness

Marine park rules require staying within sanctuary zone boundaries; accidentally drifting outside no-take areas can occur in currents.

Low risk: Slippery intertidal rocks

Rocky shore entry and exit points at Muttonbird Island have slippery, uneven terrain and can be affected by tidal changes.

Low risk: Ocean currents and rips

Convergence of tropical and temperate currents creates strong, unpredictable flows around island channels and headlands.

Low risk: Variable water conditions

Exposed offshore islands can experience sudden swell, wind chop, and reduced visibility, particularly in winter.