Pyramid Cove on Santa Catalina Island features a diverse underwater landscape comprising reefs, kelp forests, walls, canyons, and drop-offs. Divers encounter dramatic arches and deep walls within this marine environment. The site is accessible only by boat and is suited for advanced divers due to strong currents, surge, and depths ranging from 6 to 40 metres, with an average of 24 metres. Visibility typically fluctuates between 10 and 30 metres. Given the presence of deep water, overhead environments, and boat traffic, careful planning is required. The site is also rated for snorkelling, though boat access is mandatory for all visitors.

Fish Hook is a varied marine site off Santa Catalina Island featuring a combination of reef, pinnacle, and kelp forest topography. Divers can explore depths ranging from 7 to 40 metres, with an average depth of 25 metres. The site includes overhead environments such as swim-throughs, requiring solid buoyancy control. Conditions include moderate currents that can strengthen around the pinnacles, alongside potential surge in shallower sections. Visibility typically ranges from 10 to 30 metres. Access is by boat only, and divers should remain vigilant for active boat traffic. Night diving is permitted at this location.

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.

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.

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.

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.

Wilson Cove, located off Avalon, features a combination of reef structure and kelp forest at depths between 12 and 17 metres. Divers can expect visibility ranging from 5 to 10 metres. The site is accessible by boat only, and conditions include moderate currents and potential surge. Marine life frequently encountered includes common species such as Garibaldi, wrasses, Kelp Bass, and Chromis. Less common sightings include California Sea Lions, Spanish Shawls, Eagle Rays, Klipfish, and Striped Shore Crabs. Snails are very common, particularly from January through April. Due to surge and entanglement risks within the kelp, divers should maintain good buoyancy control. A full 5mm wetsuit is recommended to manage water temperatures between 15C and 19C.

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.