Half Way Wall is the gentler face of Osprey Reef. Spirit of Freedom describes bommies rising from about 20 m on the edge of a drop-off that falls more than 1,000 m, with schools of trevally, tuna and sharks. Underwater Atlas calls it the gentler alternative to the atoll's more demanding drift sites, with occasional hammerhead visits.

The layout makes for a relaxed dive by Osprey standards. The bommies on the lip of the wall give divers a structure to explore and a visual reference, while the wall beneath them provides the thrill of the abyss. Currents here are usually lighter than at the horns, so it is possible to take your time around the bommies, look into their crevices and watch the traffic in the blue.

Schools of trevally sweep along the wall, dogtooth tuna make fast passes, and grey reef and whitetip sharks patrol. Hammerheads occasionally cruise in from deeper water, a reminder of the site's oceanic setting. On the bommies themselves, soft corals, sea fans and schooling anthias add colour, and the usual reef fish of butterflyfish, angelfish, triggerfish and surgeonfish are present in numbers.

Half Way Wall is a good first dive at Osprey for divers who want to get used to wall diving in blue water before tackling the drifts, and a good choice when conditions on the exposed sides are marginal. Visibility is often 30 m or more. It suits intermediate divers with good buoyancy and attention to depth, and the bommies make it a better photography site than the plain walls.

Liveaboard only. Mike Ball's Spoilsport runs 4-night fly-dive trips (depart Cairns Thursday evening, cruise north overnight via the Ribbon Reefs, cross to Osprey, fly back from Lizard Island) and 5–7 night Coral Sea expeditions; Spirit of Freedom visits Osprey on its 4- and 7-night itineraries, with a Cairns–Lizard Island flight connection. The open-ocean crossing from the Ribbon Reefs to Osprey (about 100 km) is made overnight.

Allow 2–3 days at Osprey on a typical trip. Half Way Wall is on the sheltered western side and is dived from a mooring or tender drop.

Osprey is an isolated oceanic atoll about 350 km north-east of Cairns and roughly 100 km beyond the edge of the Great Barrier Reef, so every trip involves an overnight open-ocean crossing. Strong south-east trades (over about 25 knots, common June to August) make the crossing rough and can close the exposed eastern and southern walls; liveaboards then work the sheltered western wall and North Horn. Sep–Dec usually brings the lightest winds and visibility of 40 m or more.

Currents on the walls vary with tide and oceanic flow and can run strongly around the horns. Dec–Apr is cyclone season and trips can be cancelled or diverted to the Ribbon Reefs.

Descend to the bommies on the drop-off edge at about 20 m, explore them and the wall face below to 25–30 m while watching the blue for hammerheads, then return along the wall at a shallower depth and ascend to the reef edge for the safety stop.

Spirit of Freedom – 4- and 7-night trips including Osprey; also used by Mike Ball on Osprey itineraries.