The USS John C. Butler is an artificial reef located 30 kilometres off the coast of Avalon. This wreck site sits at depths between 18 and 30 metres, with an average depth of 24 metres. Divers must access the site by boat. Conditions include moderate currents and visibility ranging from 9 to 18 metres. The wreck presents significant overhead environments and entanglement hazards, requiring intermediate skill levels and careful navigation. Due to the structure, divers should exercise caution regarding sharp edges and surge. Water temperatures are cool, fluctuating between 14 and 18 degrees Celsius throughout the year. A torch is recommended for exploring the interior sections of the vessel.

San Clemente North is a boat-access dive site located 112 metres from shore near Avalon. The underwater topography is diverse, featuring a combination of reef, kelp forest, wall, canyon, and pinnacle structures. Divers can expect an average depth of 13 metres, with a range between 13 and 14 metres. Conditions include mild currents and visibility typically between 5 and 10 metres. Due to potential surge and variable visibility, divers should remain close to their buddy. Heavy boat traffic is a hazard, so always deploy a signal tube upon ascent. Water temperatures range from 15 to 20 degrees Celsius throughout the year.

Castle Rock is a reef dive located off the coast of Avalon, United States. The site features a reef structure at depths between 10 and 13 metres, making it suitable for beginner divers. Conditions are generally manageable with a mild current and visibility ranging from 5 to 10 metres. Access to the site is by boat only. Water temperatures fluctuate between 15 and 20 degrees Celsius throughout the year, so a 5 mm wetsuit with a hood is recommended for thermal comfort. As facilities are not confirmed at this location, divers should arrange air fills and equipment logistics prior to departure.

Coral Gardens is a reef site located 1609 metres off the coast of Avalon, Santa Catalina Island. The site features a reef structure ranging from 15 to 26 metres in depth, with an average depth of 20 metres. Divers can expect visibility of 30 metres and moderate currents. Access is by boat only. Due to the presence of surge, swell, and sharp coral, divers should exercise caution during entry and descent. Water temperatures range from 14C to 18C, making a 5mm wetsuit advisable. Beginners should remain close to their divemaster and consult with the boat crew regarding current intensity before entering the water.

Eel Point Reef, located off Santa Catalina Island, features a diverse topography of reef structures, kelp forests, and a pinnacle. Divers typically explore depths between 17 and 27 metres, with an average depth of 22 metres. This site requires boat access to avoid dangerous surf and shore break conditions. Visibility varies from 10 to 30 metres, and water temperatures range from 15C to 18C. Due to moderate currents and potential surges, this site is suited for intermediate divers with strong buoyancy control. Divers should monitor their depth gauge closely and plan descents and ascents carefully to account for changing current conditions.

Eel Point is a boat-access reef and kelp forest site located off Santa Catalina Island. Divers explore depths ranging from 12 to 30 metres, with an average depth of 15 metres. Visibility typically spans 10 to 30 metres. The site features mild currents, though conditions can shift, and divers must remain alert for boat traffic and potential entanglement within the kelp canopy. Due to the environment and hazards, including strong currents and boat traffic, this site is suited for intermediate divers. Water temperatures range from 14 to 18 degrees Celsius throughout the year, requiring appropriate thermal protection.

Seal Cove is a kelp forest and reef site located off Santa Catalina Island. Accessible only by boat, the site features depths ranging from 12 to 24 metres. Divers can expect mild currents, though surge and swell conditions can vary and require careful positioning relative to the reef and vessel. Visibility typically spans 5 to 10 metres. Given water temperatures between 15 and 19 degrees Celsius, a 5mm wetsuit is recommended. Species recorded around this area include California sea lions, eagle rays, Garibaldi, wrasses, kelp bass, klipfish, sea stars, ochre sea stars, snails, chromis, and striped shore crabs.

Inside Boiler is a reef and kelp forest site located at Santa Catalina Island. The site reaches a depth of approximately 12 metres. Divers should expect moderate currents, surge, and potential boat traffic, making this an intermediate-level dive. Access to the site is by boat only. Visibility typically ranges from 15 to 25 metres, and water temperatures fluctuate between 15C and 20C throughout the year. Night diving is permitted at this location.