Yokohama Bay is a shallow reef site on Oahu, Hawaii, suitable for both diving and snorkelling. The site features an average depth of 3 metres, making it accessible for beginners. Entry is via the shore. Marine life recorded at this site includes wrasses, which are occasionally encountered, alongside rarer sightings of Hawaiian Monk Seal, Spanish Dancer, Giant Frogfish, spiny lobster, blue dragon, sea slug, fourspot butterflyfish, banded coral shrimp, spotted boxfish, raccoon butterflyfish, flatworm, Hawaiian convict surgeonfish, and scorpionfish. Water temperatures at this location range between 24C and 27C throughout the year.

The Seaplane Wreck off Oahu is an artificial reef resting at depths between 18 and 35 metres. This site requires boat access and is suited for advanced divers due to significant depth, strong currents, and the overhead environment presented by the wreckage. Visibility typically ranges from 24 to 30 metres, allowing for clear views of the structure. Divers should maintain strict buoyancy control and monitor air supply closely throughout the dive. Given the potential for shifting currents, surface marker buoys are essential. This site is not suitable for beginners or those without appropriate advanced training for deep, overhead environments.

Makaha Caverns on Oahu offers a straightforward introduction to cavern diving with depths ranging from 8 to 15 metres. The site features a reef and cavern structure accessible via both shore and boat entry, located approximately 150 metres from the shore. Visibility typically spans 10 to 30 metres, allowing for clear observation of the cavern openings. While mild currents are standard, divers should monitor for surge and swell, which can increase in force within the caverns. Facilities available on-site include parking, toilets, showers, and a rinse station. The site is suitable for Open Water certified divers, with typical dives lasting around 50 minutes.

Turtle's Reef is a marine reef site located off the coast of Oahu, United States. Accessible only by boat, the site sits approximately 4023 metres from shore. Divers can expect depths ranging from 5 to 12 metres, with an average depth of 10 metres. Conditions are generally mild, with visibility typically between 15 and 30 metres. Water temperatures remain consistent throughout the year, averaging between 25 and 26 degrees Celsius. The site is suitable for beginners, with typical dives lasting around 30 minutes. Hazards at this location include boat traffic and the presence of sharks. Guided tours, boat charters, and equipment rental facilities are available for visitors.

Five Inch Reef is a marine reef site located off the coast of Oahu, Hawaii. The site is characterised by a consistent depth of approximately 8 metres, making it a suitable location for beginner divers. Conditions at this site are subject to variation, though water temperatures remain stable between 25C and 27C throughout the year. As a reef environment, the topography consists of submerged rock structures typical of the region. Access to this site is typically by boat, and it is suitable for those seeking shallow, accessible reef diving.

Pokai Bay on Oahu offers a shore-entry reef experience suitable for beginners. The site features depths ranging from 6 to 21 metres, with an average depth of 10 metres. Conditions vary, with visibility between 1 and 15 metres and mild currents. Divers and snorkellers should be aware of potential hazards including surf, strong currents, sharp coral, jellyfish, and sharks. Facilities at the site include parking, toilets, and showers. Species recorded around this area include the Spanish Dancer, Potter's Angelfish, Whitetip Reef Shark, Leaf Scorpionfish, Speckled Butterflyfish, Blue Dragon, Wedgetail Triggerfish, Snake Eel, Varicose Wart Slug, Scorpionfish, Desirable Flabellina, Slate Pencil Urchin, Slipper Lobster, and African Clown Wrasse.

The LCU is a landing craft utility vessel located off the coast of Oahu. Originally used to transport troops and equipment, the wreck now serves as an artificial reef. This site is intended for advanced divers due to its depth, which ranges from 18 to 28 metres with an average of 27 metres. Access is by boat only, and divers should be prepared for variable currents. Visibility can reach up to 30 metres, and water temperatures remain between 24 and 26C throughout the year. Divers must be aware of the deep nature of the site and the presence of sharks.

Haleiwa Trench is an advanced shore-accessible dive site on Oahu featuring a combination of artificial reef structures and a wall that drops to 30 metres. Divers typically explore between 3 and 30 metres, with an average depth of 15 metres. The site is home to diverse marine life, including common Spanish Dancer and various wrasses. Uncommon sightings include Snowflake Moray, Turkey Moray, Pustular Phyllidia, pufferfish, and Speckled Butterflyfish. Rare species such as Spotted Eagle Ray, Leaf Scorpionfish, Day Octopus, Zebra Moray, Tiger Reef Eel, and White-spotted Octopus are also recorded. Entry requires navigating a surf break, and divers must remain alert for boat traffic and moderate currents.