Halfway Wall sits midway between North Horn and False Entrance along Osprey Reef's western flank in the remote Coral Sea. This spectacular wall dive site features a steep drop-off plunging over 1,000 metres into the abyss, with several coral bommies rising from around 20 metres near the mooring line. Known for its crystal-clear waters (30–100m visibility) and abundant pelagic marine life, it offers snorkellers and divers an unforgettable encounter with the wild, pristine edge of Australia's Coral Sea Marine Park — a true oceanic wilderness far from the mainland.
Halfway Wall
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Wave Height 0.5 mSwell Period 5.8 sWind Speed 8.6 knPrecipitation 2.0 mmTidal Phase flood
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DANGER: Explicit Risks Present
Halfway Wall has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Extreme depth drop-off danger
The wall drops from the surface to over 1,000 metres. Snorkellers must stay near the mooring line and bommies to avoid drifting over the abyss.
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Community contribution: submitted by Daniel
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High risk: Extreme depth drop-off
The wall drops from the surface to over 1,000 metres. Snorkellers must stay near the mooring line and bommies to avoid drifting over the abyss.
Moderate risk: Ocean currents
Strong currents can sweep along the wall, particularly during tidal changes, making it challenging to maintain position.
Moderate risk: Extreme remoteness
Located 300 km offshore, the site is reachable only by multi-day boat. Emergency evacuation is very difficult and slow.
Low risk: Shark encounters
Grey reef sharks, white tip reef sharks, and occasionally hammerheads are commonly sighted. While generally not aggressive, their presence requires caution and respect.
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Getting in
Snorkel tour
Entry
Halfway Wall is located on the western side of Osprey Reef in the Coral Sea, approximately 300 km north-east of Cairns, Queensland. Access is exclusively via multi-day liveaboard expeditions departing from Cairns or Port Douglas. The site is marked by a permanent mooring on the edge of the wall.
Parking & facilities
No on-site parking. Departure marinas in Cairns (Reef Fleet Terminal) or Port Douglas have paid parking nearby.
toiletsshowers
Part of liveaboard tour packages; no standalone entry fee. Prices vary by operator and trip duration (typically 4–7 night trips).
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About this data
- Conditions last evaluated
- Spot data last updated
- Data sources
- Open-Meteo (marine & weather conditions), tide predictions via UTide, community contributors (descriptions, hazards, marine life).
- License
- Spot content licensed under CC BY-SA 4.0. How's the Spot is open source.
Weather & swell ┬╖ Open-Meteo marine & weather APIs Tides ┬╖ UTide harmonic analysis Sea & safety ┬╖ community reports