Corne de Tenia features a dramatic topography comprising a reef, wall, canyon, and drop-off reaching depths of 65 metres. Located 50 kilometres from shore, this site is accessible only by boat. Intermediate divers typically explore the 3 to 30-metre range, where moderate currents can funnel through the canyon. Visibility varies significantly from 5 to 40 metres. Divers frequently encounter Napoleon wrasse, whitetip reef sharks, broadclub cuttlefish, and scorpionfish. Other species include various wrasses, butterflyfish, and hawkfish. Divers should exercise caution with hand placement on ledges due to camouflaged scorpionfish. Dive shops in Noumea provide air fills for this year-round site.

Îlot M'Bo is a small islet located in the northern lagoon of Nouméa, featuring a coral reef that encircles the island. The site offers a drop-off and reef environment suitable for snorkelers, with depths ranging from 2 to 10 metres and an average depth of 5 metres. Access is via the shore, with the reef located approximately 200 metres from the island. Conditions include moderate currents, and snorkelers should be aware of sharp coral. The water temperature fluctuates between 23C and 28C throughout the year. This site is well-suited for beginners, providing a 60-minute typical snorkel experience.

Le Humboldt is a deliberately sunk wreck located off Îlot Signal, serving as an artificial reef. The structure sits at a depth of 20 to 22 metres, making it a suitable site for intermediate divers to gain wreck experience. Access is by boat only. Visibility at the site ranges from 10 to 30 metres, with water temperatures fluctuating between 23C and 27C throughout the year. Divers should remain aware of potential strong currents and the significant depth of the surrounding area, which reaches 26 to 30 metres. The wreck allows for a methodical exploration of the hull and surrounding substrate.

Ilot Signal, located off the coast of Noumea, offers a diverse underwater environment featuring natural reef, seagrass beds, and artificial reef structures. This site is well-suited for beginners, with depths ranging from 1 to 8 metres and an average depth of 4 metres. Conditions are generally manageable, with mild currents and visibility between 10 and 30 metres. Water temperatures fluctuate between 23 and 27 degrees Celsius throughout the year. Access is by boat, and divers should remain aware of boat traffic at the surface. Due to the presence of sea urchins across the reef, protective footwear and careful fin placement are recommended.

Îlot Signal is a shallow reef and seagrass site located off the coast of Nouméa. Divers and snorkellers can explore depths ranging from 1 to 8 metres. The site features a reef drop-off and extensive seagrass beds. Marine life recorded here includes sea kraits, which are very common, alongside wrasses and rock cod. Less frequently, divers may encounter Napoleon wrasse, whitetip reef sharks, crocodile fish, harlequin sweetlips, zebra lionfish, day octopus, turkey moray, giant trevally, emperor angelfish, barrier reef anemonefish, and keyhole angelfish. Hazards include boat traffic, sharks, and sharp coral. Facilities at the islet include toilets and access to boat charters.

Passe de Dumbéa is a deep reef drift dive located near Îlot Signal. This site features a reef wall ranging from 25 to 50 metres in depth, making it suitable for intermediate divers comfortable with significant depth and strong currents. Access is by boat only, and divers should time their entry with the outgoing tide to utilise the current. Visibility typically ranges between 10 and 30 metres, with water temperatures between 23 and 25 degrees Celsius. Due to the strong currents and depth, a surface marker buoy is essential for safety. Divers should monitor depth gauges closely and avoid contact with reef structures to prevent entanglement.