Looking Glass Wall extends the famous swim-through feature next door into a genuine deep-wall dive, a boulder slope dropping from around fifteen metres down to forty metres and studded with caves and overhangs thick with colourful sponge growth. Where the Looking Glass itself is a relatively brief, shallow highlight, the wall gives divers with more depth experience and better air consumption a chance to spend a full dive exploring the same general area in greater depth and detail, and it holds one of the area's more sought-after rarities: a cave known to be used by the eastern blue devil fish, an unusual and strikingly patterned species that draws dedicated fish-spotters to seek it out specifically. The wall's boulder-and-cave structure supports a broad range of sponge and soft coral growth that provides both colour and habitat complexity, and divers exploring it can expect to encounter much of the same broader marine life recorded around the Looking Glass and Shark Gutters nearby, given the proximity and shared exposure to the same currents and nutrient-bearing water.

Because the site runs to a genuine 40 metres, it demands a properly planned multi-level profile and is not a site for divers pushing the limits of their training; a sensible approach uses the deeper wall as the first phase of the dive before working back up to shallower ground, potentially finishing at the Looking Glass itself if the itinerary and no-decompression limits allow. This is one of the better dives at Broughton Island for divers who want depth and structure over the more crowd-focused shark encounter at the adjoining passage.

Boats depart Nelson Bay marina and run approximately 20 km/45-60 minutes north-east to Broughton Island, weather and vessel dependent. There is no facility or dive shop on the island itself; all diving is via day-trip charter from Nelson Bay, typically with two dives per trip around the island's northern and western sides depending on conditions.

Broughton Island sits fully exposed to ocean swell and is the first site cancelled when an easterly or north-easterly blow picks up; operators want well under 1.5 m swell and moderate wind to make the run worthwhile. The island's north side, where the grey nurse shark critical habitat sites (Looking Glass, Shark Gutters, North Rock) are found, gets some lee from a southerly, while other sides suit other wind directions, so skippers choose the exact site on the day. Visibility is best in autumn and winter, typically 10-25 m, and drops after rain from the mainland catchments.

Surge is common in the shallower features like Looking Glass and needs to be managed as a group.

Descend the boulder slope adjoining the Looking Glass and work down the wall from 15 m toward 40 m as depth allows, checking caves along the way for the rare eastern blue devil fish and other cryptic species, before ascending back up the slope to finish at the shallower Looking Glass feature if gas and time permit.

Approaches recreational depth limits — plan gas and time conservatively; not for divers without genuine deep-diving experience.

Let's Go Adventures (Nelson Bay) and Feet First Dive (Nelson Bay) both run daily boat trips to Broughton Island, weather permitting.