Dibley's is one of the lesser-documented Lighthouse Bay sites, named by Exmouth operators alongside Blizzard Ridge and Gulliver's. It shares the bay's general character: limestone ridge-line reef rising from sand in 8–15 m, with ledges, cracks and rocky outcrops that concentrate fish in an otherwise sandy area.

Operator descriptions of Lighthouse Bay dives mention rocky outcrops, coral ledges and deep cracks in the reef, large schools of fish, sea snakes, crayfish, shrimp, turtles and reef sharks — all of which apply here. Whitetip reef sharks and wobbegongs rest in the cracks, and the ledges are good places to look for moray eels and nudibranchs. Seasonal visitors include manta rays and humpback whales.

Because individual accounts of Dibley's are scarce, it is best considered an alternative to the main three sites when those are occupied or when the skipper wants variety. It is suitable for Open Water divers and guided Discover Scuba participants in normal conditions.

The bay's hard corals were affected by the 2025 marine heatwave.

Planning notes: Open Water certification is recommended and the site is rated beginner. Expect to spend most of the dive around 12 m, with a maximum of about 15 m. Access is by boat only, and site selection depends on wind, swell and tide on the day. Best season: April–November (whale sharks March–July, humpbacks July–October, mantas year-round). Traffic: moderate (occasional charters/club dives).

From Exmouth, charters meet at the operator's shopfront or collect divers from accommodation and either launch at Bundegi boat ramp (about 14 km north of town on Murat Road, sealed, 2WD) or travel from Exmouth Marina (Mortimer Road, 2 km south of town). Lighthouse Bay sits just north of Vlamingh Head Lighthouse at the very tip of North West Cape, roughly 30–45 minutes by boat from Bundegi depending on sea state. Operators run double-dive days with a lunch break on board; sites are on public moorings installed to protect the reef, so the boat ties off and divers giant-stride from the back deck.

Lighthouse Bay is on the northern tip of the Cape and is sheltered from the prevailing south to south-westerly swell that hits the western side, which is why it is the fallback when the west side and Muirons are blown out. It becomes rough in strong northerly or north-easterly winds and in the afternoon south-westerly sea breeze that wraps around the Cape (often 15–25 knots from late spring to autumn), so trips run in the morning. Visibility is 5–20 m, dropping around the March–April coral spawn and during plankton blooms.

Cyclone season runs November to April; trips are cancelled for cyclone warnings. Tidal flow is noticeable around the Cape on springs.

Descend the mooring to the reef base, follow the reef edge on one side outbound at 12–14 m and return shallower over the top. Surface on the mooring line after a safety stop.

Dive Ningaloo – double boat dives several days a week, all certification levels including Discover Scuba; Exmouth Dive & Whalesharks Ningaloo – regular Lighthouse Bay trips; Ningaloo Whaleshark Swim (Whalesharks Exmouth) and Ningaloo Whaleshark-N-Dive – Lighthouse Bay dives as weather allows.