Broughton Island - The Looking Glass

High risk: Overhead cave environment

The cave is a confined overhead space requiring good buoyancy control and cave-diving awareness. Exit to open water requires swimming back the way you entered.

Moderate risk: Overhead rock arch / confined swim-through

The Looking Glass is a narrow, enclosed rock passage with an overhead ceiling. Snorkellers must be comfortable with confined spaces and careful not to surface into rock.

Moderate risk: Depth variation

Depth changes rapidly from 8 m inside the crack to 18-26 m outside. Snorkellers should stay on the surface or in shallow areas only.

Moderate risk: Surge inside the arch

Strong surge can push snorkellers and divers against the rock walls inside the narrow crack. Group agreement on riding or fighting the surge is essential.

Moderate risk: Shallow ceiling in the gap

The arch shallows to about 8 m; poor buoyancy control can lead to accidental surfacing or contact with the rock overhead.

Moderate risk: North-easterly winds (summer)

NE winds (common in summer) can create choppy conditions on the exposed eastern side of Broughton Island, making the return crossing uncomfortable or unsafe.

Moderate risk: Strong currents at gutters

Big Shark Gutters and Little Shark Gutters can develop strong tidal flows through the rock channels, requiring good fitness and awareness.

Moderate risk: Northeasterly winds

Common summer north-easterly winds (especially early in the day) and southerly winds can create rough sea conditions, making boat passage and snorkelling hazardous.

Moderate risk: Strong ocean currents around headlands

Tidal currents can be strong off the northern and eastern points of the island, especially around Coal Shaft Bay and the Looking Glass passage.

Moderate risk: Air pocket hazard

A large air pocket in the cave roof contains potentially hypoxic or contaminated gas. Do NOT breathe from the pocket — always use your regulator.

Moderate risk: Surge and sea conditions

Moderate seas can create strong surge inside the cave and at the entrance, making entry/exit hazardous. Best in calm conditions.

Moderate risk: Depth limitations

Entrance at 13 m, slope drops to 18 m. This depth range makes it unsuitable for beginner snorkelers and requires diving certification for scuba.

Low risk: Surge inside the crack

A strong surging current can push snorkellers and divers against the rock walls inside the narrow passage. Groups must coordinate to ride or fight the surge.

Low risk: Boat traffic

Access is exclusively by boat and charter vessels frequently navigate around the island. Snorkellers should stay aware of boat movements near the entrance.

Low risk: Remote island access

Broughton Island is boat-access only with no on-site medical facilities. Emergency response times are long.

Low risk: Nesting bird colonies

Silver gulls and terns nest on the southern rocky isthmus; eggs and chicks are camouflaged underfoot. Disturbing nesting birds is prohibited.

Low risk: Sharp volcanic rock

The island's volcanic terrain includes sharp rocks and boulders along the shoreline, posing a cut hazard when entering or exiting the water.

Low risk: Limited access to medical help

The island is remote with no medical facilities. Any injury requires boat evacuation back to the mainland (45–60 min journey).

Low risk: Marine stingers

Bluebottles and occasional jellyfish can appear, particularly in warmer months from November to March.