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.

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.

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.

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.

Mākua Beach on Oahu offers a shallow shore dive featuring a mix of reef and seagrass habitats. Divers can explore depths ranging from 2 to 7 metres, with visibility typically between 10 and 30 metres. The site is suitable for newly certified divers, as the underwater conditions are generally manageable with only mild currents. Entry requires caution due to the shore break and surf zone. Protective footwear is recommended to avoid injury from sharp coral and rocks on the seabed. Water temperatures remain consistent throughout the year, ranging from 24 to 27 degrees Celsius.

Tracks Beach Park in Oahu offers a shallow shore dive featuring a mix of reef and artificial reef structures. Divers typically explore at an average depth of 4 metres, with dives lasting around 30 minutes. The site is suitable for beginners, though conditions vary with mild currents and potential surge. Visibility fluctuates significantly, ranging from 2 to 33 metres. Marine life recorded here includes wrasses, speckled butterflyfish, and forcepsfish. Divers may also encounter giant frogfish, Spanish dancer, spotted eagle ray, leaf scorpionfish, Potter's angelfish, whitetip reef shark, yellow-edged moray, day octopus, turkey moray, oriental flying gurnard, and snowflake moray. Facilities at the park include parking, toilets, and showers. Be aware of rip currents and sharp coral.

Electric Beach in Oahu is a reef and artificial reef site defined by the warm water discharge from the adjacent power plant. This discharge attracts a high volume of marine life to the area. Divers typically access the site from the shore, swimming approximately 180 metres to reach the reef. Depths range from 3 to 12 metres, with an average of 8 metres. Conditions at this site are variable, with visibility ranging from 3 to 33 metres. The site is suited for intermediate divers due to the presence of strong currents, rip currents, and surf. Boat traffic is a known hazard in the area. Facilities include parking, toilets, and showers.